Type B PEX is not expandable. Unlike Type A and Type C PEX, which are known as “expansion PEX,” Type B PEX is manufactured differently and does not have the ability to expand. Type B PEX is made using a different production process called the silane method, which involves crosslinking the polyethylene using chemicals. This method creates a more rigid and inflexible pipe that cannot expand and contract like expansion PEX.
- Type B PEX is not expandable.
- It is manufactured using the silane method.
- Silane method creates a more rigid and inflexible pipe.
- Type A and Type C PEX are known as expansion PEX.
- Expansion PEX can expand and contract.
Please note that when working with PEX pipes, it’s essential to use the appropriate type for your specific application to ensure proper performance and compatibility with fittings and connectors.
Advantages of Type B PEX
Type B PEX (cross-linked polyethylene) offers several advantages that make it a preferred choice for plumbing and heating systems:
Flexibility: Type B PEX is highly flexible, allowing for easy installation around obstacles and corners without the need for additional fittings. Its flexibility reduces the number of connections and potential leak points, improving overall system reliability.
Resistance to freezing: Type B PEX has excellent freeze-thaw resistance, making it suitable for both indoor and outdoor applications. It can expand and contract without cracking, minimizing the risk of pipe damage in cold climates.
Corrosion resistance: Unlike metal pipes, Type B PEX does not corrode or scale over time, ensuring long-term durability and maintaining water quality.
Low thermal conductivity: PEX has low thermal conductivity, meaning it retains heat better than metal pipes. This property improves energy efficiency, reducing heat loss and saving on utility bills.
Cost-effective: Type B PEX is more affordable compared to copper or stainless steel pipes. Its ease of installation, combined with fewer fittings and reduced labor costs, makes it a cost-effective option for plumbing and heating systems.
Chemical resistance: Type B PEX is resistant to chemical degradation, making it suitable for various applications, including potable water systems.
In summary, Type B PEX offers flexibility, freeze-thaw resistance, corrosion resistance, low thermal conductivity, cost-effectiveness, and chemical resistance, making it an excellent choice for a wide range of plumbing and heating applications.
Disadvantages of Type B PEX
Type B PEX, also known as cross-linked polyethylene tubing, has certain disadvantages that should be considered before its installation:
Limited availability: Type B PEX is less common compared to other types, such as Type A and Type C. This limited availability can make it challenging to find the necessary fittings and connectors for installation or repairs.
Higher cost: Type B PEX tends to be more expensive than other types of PEX due to its manufacturing process and lower demand. This higher cost can impact the overall budget of a plumbing project.
Lower flexibility: Unlike Type A PEX, which is highly flexible, Type B PEX is less flexible and can be more difficult to maneuver in tight spaces. This limitation may require additional fittings and connectors to navigate corners and obstacles.
Lower resistance to UV rays: Type B PEX is not as resistant to UV rays as Type A PEX, which means it should not be exposed to direct sunlight for extended periods. This limitation makes it unsuitable for outdoor applications without proper insulation or protective covering.
Potential for leaching: Some studies suggest that Type B PEX may have a higher potential for leaching chemicals into the water supply compared to other types. Although PEX is generally considered safe for drinking water, further research is needed to fully understand the long-term effects.
It is important to weigh these disadvantages against the specific needs and requirements of a plumbing project before choosing Type B PEX.
Understanding PEX Tubing
PEX tubing is a versatile plumbing material that has gained popularity in recent years. It is made from cross-linked polyethylene, which gives it enhanced durability and flexibility. Here are some key points to understand about PEX tubing:
Flexible and Easy to Install: PEX tubing is highly flexible, allowing for easy installation in tight spaces and around obstacles. It can be bent and curved without the need for additional fittings, reducing the risk of leaks.
Resistance to Corrosion: Unlike metal pipes, PEX tubing is resistant to corrosion, ensuring a longer lifespan and fewer maintenance issues. It also resists scale buildup and is less prone to freezing and bursting.
Wide Range of Applications: PEX tubing is suitable for various plumbing applications, including potable water supply, radiant heating systems, and even underground installations. It can handle both hot and cold water efficiently.
Reduced Noise and Energy Loss: PEX tubing has excellent insulation properties, reducing noise transmission and minimizing heat loss. This results in quieter plumbing systems and lower energy bills.
Compatibility with Fittings: PEX tubing is compatible with a range of fittings, including crimp, clamp, and push-fit connections. This versatility allows for easy integration with existing plumbing systems.
Overall, PEX tubing offers numerous benefits, including durability, flexibility, and ease of installation. Its corrosion resistance and insulation properties make it a reliable choice for various plumbing applications.
PEX Tubing Types
PEX tubing is a popular choice for plumbing and radiant heating systems due to its flexibility, durability, and cost-effectiveness. There are several types of PEX tubing available, each with its own characteristics and applications:
PEX-A: This type is known for its highest flexibility, making it easier to work with in tight spaces and reducing the risk of kinks. It can expand up to three times its original size and then contract back, making it resistant to freezing and bursting.
PEX-B: It is the most commonly used type of PEX tubing. It offers excellent freeze resistance and durability. It has a slightly lower flexibility compared to PEX-A.
PEX-C: This type is manufactured using an extrusion method, resulting in a more rigid tubing. It is a good choice for commercial applications and is often used for larger diameter pipes.
Regardless of the type, PEX tubing is a reliable option for various plumbing and heating needs, providing long-lasting performance and reducing the chances of leaks.
Differences Between Type A, B, and C PEX
Type A, B, and C PEX are three different classifications of cross-linked polyethylene (PEX) tubing used in plumbing systems. Each type has distinct characteristics that make it suitable for various applications. Here are the key differences:
Type A PEX: This is the most durable and commonly used PEX type. It features a strong chemical resistance and can withstand high temperatures. Type A PEX is the only type suitable for use in both hot and cold water plumbing systems. It is also the most flexible and can be bent around corners without the need for additional fittings.
Type B PEX: Type B PEX is less flexible than Type A, but it still offers good strength and durability. It is primarily used in residential applications for cold water plumbing systems. It is not recommended for use with hot water due to its lower temperature resistance.
Type C PEX: Type C PEX is the least expensive option and is commonly used in budget-friendly plumbing installations. It has a lower pressure rating and is suitable for cold water applications only. Type C PEX is less flexible than Type A and B, requiring more fittings and connections.
It’s essential to select the appropriate PEX type based on the specific requirements of your plumbing project to ensure optimal performance and longevity.
Features of Type B PEX
Type B PEX is a flexible piping material commonly used in plumbing systems. It offers several important features that make it a popular choice among professionals:
Flexibility: Type B PEX can easily bend and adapt to various installation requirements, reducing the need for connectors and fittings.
Corrosion resistance: It is highly resistant to corrosion, ensuring long-term durability and reducing the risk of leaks or pipe failures.
Heat resistance: Type B PEX can withstand high temperatures, making it suitable for both hot and cold water applications.
Chemical resistance: It is resistant to chemicals commonly found in plumbing systems, reducing the risk of damage or degradation over time.
Noise reduction: Type B PEX helps minimize water hammer and flow noise, providing a quieter plumbing system.
Scalability: It can be easily expanded or modified without the need for complex tools or extensive labor.
Cost-effective: Type B PEX is often more affordable than traditional piping materials and requires fewer installation materials, resulting in cost savings.
These features collectively make Type B PEX a reliable and efficient choice for various plumbing applications.
PEX Expansion Method
The PEX expansion method is a popular technique used for installing cross-linked polyethylene (PEX) pipes in plumbing systems. It involves the use of an expansion tool to enlarge the PEX pipe and insert fittings, creating a secure and watertight connection.
Key features of the PEX expansion method include:
Strong and reliable connections: The expansion process creates a tight bond between the pipe and the fitting, ensuring a durable and leak-free joint.
Flexibility: PEX pipes can be easily bent and maneuvered around obstacles, allowing for more flexible installation compared to traditional rigid pipes.
Corrosion resistance: PEX pipes are highly resistant to corrosion, extending their lifespan and reducing maintenance needs.
Easy installation: The expansion method simplifies the installation process by eliminating the need for solvents, glues, or open flames, making it a safer and more efficient option.
Overall, the PEX expansion method offers a reliable and versatile solution for plumbing systems, providing homeowners and professionals with a durable and efficient pipe installation method.
Is Type B PEX Expandable?
Yes, Type B PEX (cross-linked polyethylene) is expandable. Type B PEX is a flexible piping material commonly used in plumbing and heating systems. It offers excellent resistance to corrosion, scale, and chlorine, making it a popular choice for residential and commercial applications.
The expandability of Type B PEX refers to its ability to expand and contract without compromising its structural integrity. This property allows for easy installation using the expansion method, where the PEX pipe is expanded and then fitted onto fittings without the need for soldering or clamps. Upon cooling, the pipe shrinks and creates a secure connection.
Advantages of Type B PEX include:
- Flexibility: It can bend and curve to fit around obstacles, reducing the need for additional fittings.
- Durability: PEX is resistant to cracking and bursting, making it suitable for both hot and cold water applications.
- Longevity: It has a lifespan of up to 50 years, providing reliable performance over an extended period.
- Cost-effective: PEX installation is typically faster and more affordable than traditional pipe materials.
Overall, Type B PEX’s expandable nature and other beneficial properties make it a versatile and reliable option for various plumbing and heating projects.
Benefits of Expandable PEX
Expandable PEX (cross-linked polyethylene) offers several advantages that make it a popular choice for plumbing and heating systems.
1. Easy Installation: Expandable PEX is highly flexible, allowing for easy installation even in tight spaces. It can be bent and curved without the need for excessive fittings, reducing the chances of leaks and simplifying the installation process.
2. Versatility: PEX can be used for both hot and cold water applications, as well as for radiant heating systems. Its versatility makes it a convenient option for various plumbing and heating needs.
3. Durability: PEX is resistant to corrosion, scaling, and chemical damage, increasing its lifespan and reducing the need for repairs or replacements. It can withstand high pressures and temperatures, ensuring long-term performance.
4. Freeze Resistance: PEX has the ability to expand and contract, making it highly resistant to freezing temperatures. This property minimizes the risk of bursting pipes during cold weather conditions.
5. Cost-Effective: Expandable PEX is cost-effective compared to traditional piping materials. Its ease of installation, durability, and long lifespan contribute to lower maintenance and replacement costs over time.
6. Noise Reduction: PEX is known for its quiet operation due to its inherent sound-dampening properties. It minimizes water hammer noises, providing a more peaceful and comfortable living environment.
In summary, the benefits of expandable PEX include easy installation, versatility, durability, freeze resistance, cost-effectiveness, and noise reduction. These advantages make it an excellent choice for plumbing and heating systems.
Compatibility with Expansion Fittings
Expansion fittings are an essential component in various industries to accommodate thermal expansion and contraction of pipes, ensuring their integrity and preventing damage. When selecting components for a piping system, it is crucial to consider their compatibility with expansion fittings to ensure a reliable and durable installation. Here are a few key factors to consider:
Material Compatibility: The expansion fittings should be compatible with the materials used in the piping system, such as steel, copper, or plastic. This ensures proper sealing and avoids corrosion or chemical reactions.
Size and Type: The expansion fittings should match the size and type of the pipes being used. This includes considering factors such as diameter, wall thickness, and joint type (e.g., threaded, soldered, or welded).
Flexibility: Expansion fittings should allow for adequate movement of the pipes during thermal expansion and contraction. This can be achieved through the use of flexible joints, such as bellows expansion joints or expansion loops.
Pressure and Temperature Ratings: The expansion fittings should have sufficient pressure and temperature ratings to handle the conditions within the piping system. This ensures safe operation and prevents failures.
By considering these factors, you can ensure compatibility between expansion fittings and your piping system, promoting efficient and trouble-free operation.
PEX Expansion Tools
PEX expansion tools are essential for installing and repairing PEX (cross-linked polyethylene) plumbing systems. These tools are designed to make the installation process easier and ensure secure connections. Here are some key features and benefits of PEX expansion tools:
Efficient Expansion: PEX expansion tools utilize a unique expansion method that allows the PEX pipe to fit securely onto fittings. This eliminates the need for traditional crimping or compression methods.
Reliable Connections: The expansion process creates a tight and reliable connection between the PEX pipe and fittings. This helps prevent leaks and ensures long-lasting performance.
Versatility: PEX expansion tools are compatible with various PEX pipe sizes and types, including PEX-A, PEX-B, and PEX-C. They can be used for both residential and commercial plumbing applications.
Ease of Use: These tools are designed to be user-friendly, with ergonomic handles and straightforward operation. They allow for quick and hassle-free installation, saving time and effort.
Durability: PEX expansion tools are typically made from high-quality materials, ensuring durability and longevity. They are built to withstand the rigors of professional use.
Overall, PEX expansion tools are indispensable for professionals and DIY enthusiasts working with PEX plumbing systems, offering efficiency, reliability, versatility, ease of use, and durability.
Expansion vs. Crimp Method for PEX
The expansion and crimp methods are two common techniques used for connecting PEX (cross-linked polyethylene) pipes. Here are the key points to consider when comparing the two:
– Uses an expansion tool to stretch the PEX pipe and fit it over an expansion fitting.
– Provides a secure connection by creating a strong bond between the pipe and fitting.
– Requires an expansion tool and appropriate fittings.
– Offers reliable connections with minimal risk of leaks.
– Suitable for both residential and commercial applications.
– Allows for easy disassembly if needed.
– Requires additional fittings specifically designed for expansion connections.
– Involves using a crimping tool to compress a copper or stainless steel ring around the pipe and fitting.
– Provides a reliable and cost-effective connection.
– Requires a crimping tool and suitable rings.
– Offers a quick and straightforward installation process.
– Requires precise measurement and proper technique to ensure a leak-free connection.
– Suitable for various PEX pipe sizes and applications.
– May require additional fittings for transitions or specific connections.
Both methods have their advantages and are widely used in PEX installations. The choice between expansion and crimp method ultimately depends on personal preference, project requirements, and available tools and fittings.
Expansion Ring Installation Process
The installation process for expansion rings involves the following steps:
Preparation: Ensure that the surface is clean, free from debris, and properly leveled.
Measurement: Measure the circumference of the object where the expansion ring will be installed.
Cutting: Cut the expansion ring to the required length, allowing for a slight overlap for a secure fit.
Alignment: Align the ends of the expansion ring and secure them together using the provided fasteners.
Installation: Wrap the expansion ring around the object, ensuring that it is centered and positioned evenly.
Tightening: Use a wrench or other suitable tool to tighten the fasteners, ensuring a snug and secure fit.
Testing: Verify the installation by applying pressure or subjecting the object to its intended use, ensuring that the expansion ring functions as intended.
Finishing: Trim any excess material and ensure that the expansion ring is neatly installed and visually appealing.
Maintenance: Regularly inspect the expansion ring for any signs of wear or damage, and replace as necessary to maintain its effectiveness.
By following these steps, the installation process for expansion rings can be successfully completed, providing a reliable and durable solution for various applications.
Expansion Sleeve Installation Process
The expansion sleeve installation involves the following steps:
Preparation: Gather all the necessary tools and equipment, including the expansion sleeve, fasteners, and a drill. Ensure the work area is clean and free of debris.
Measurement and Marking: Measure the diameter and depth of the hole to determine the appropriate size of the expansion sleeve. Mark the drilling location on the surface.
Drilling: Use a drill with the appropriate size drill bit to create a hole according to the marked location and depth. Clean any dust or debris from the hole.
Insertion: Insert the expansion sleeve into the drilled hole, ensuring it fits snugly. Tap it gently with a hammer to ensure it is properly seated.
Fastening: Insert the fastener into the expansion sleeve and tighten it using a wrench or screwdriver, depending on the type of fastener used.
Verification: Check the installed expansion sleeve to ensure it is secure and properly aligned.
Finishing: Clean the area around the installed expansion sleeve and remove any excess material or debris.
Remember to follow the manufacturer’s guidelines and specifications for the specific expansion sleeve and fastener being used.
Expansion PEX vs. Non-Expansion PEX
Expansion PEX and non-expansion PEX are two types of cross-linked polyethylene (PEX) pipes used in plumbing systems. Here are the key differences:
1. Flexible and expandable: It can expand and contract to fit around fittings, reducing the need for additional connectors.
2. Fewer fittings: The ability to expand allows for longer pipe runs with fewer fittings, reducing the risk of potential leaks.
3. Lower pressure drops: Expansion PEX typically experiences lower pressure drops compared to non-expansion PEX, resulting in better water flow.
4. Requires expansion tool: Specialized expansion tools are necessary to properly install and secure the connections.
1. More rigid: Non-expansion PEX is stiffer and less flexible than expansion PEX, making it suitable for certain applications that require straight runs.
2. Compatible with crimp or clamp fittings: Non-expansion PEX is typically used with crimp or clamp fittings, which are different from the expansion fittings used with expansion PEX.
3. Lower cost: Non-expansion PEX is generally less expensive than expansion PEX.
4. Requires more fittings: Due to its rigidity, non-expansion PEX often requires more fittings for complex plumbing layouts.
Both types of PEX have their advantages and are widely used depending on the specific requirements of the plumbing project.
Expansion PEX Applications
Expansion PEX offers a versatile and reliable solution for a wide range of applications. Its flexibility and durability make it an excellent choice for plumbing systems, where it can be used for both hot and cold water supply lines. The expansion properties of PEX allow for easy installation, especially in tight spaces and around corners.
In addition to plumbing, Expansion PEX is also commonly used in radiant heating systems, providing efficient and even heat distribution. It can be installed in the floor, walls, or ceiling, making it an ideal choice for underfloor heating.
Other applications of Expansion PEX include:
- Snow melting systems: PEX tubing can be installed under driveways, walkways, and stairs to melt snow and ice.
- Fire sprinkler systems: The flexibility of PEX allows for easy installation in various building structures.
- Hydronic piping: PEX tubing is used for transporting water or other fluids in heating and cooling systems.
Overall, Expansion PEX is a versatile material that finds application in plumbing, heating, and other fluid transportation systems, providing efficiency, durability, and ease of installation.
Expansion PEX in Plumbing Systems
Expansion PEX is a popular choice for plumbing systems due to its flexibility and durability. PEX stands for cross-linked polyethylene, which undergoes a process that enhances its strength and resistance to high temperatures. Here are some key points about expansion PEX in plumbing systems:
- Expansion: This type of PEX has the ability to expand and contract with temperature changes, reducing the risk of pipe damage caused by freezing or thermal expansion.
- Flexibility: Expansion PEX is highly flexible, allowing for easier installation around corners and obstacles without the need for additional fittings.
- Leak resistance: The seamless nature of PEX eliminates the need for soldering or gluing, reducing the risk of leaks and water damage.
- Corrosion resistance: Unlike metal pipes, expansion PEX does not corrode or rust, providing a longer lifespan and improved water quality.
- Cost-effective: PEX is generally more affordable than copper or PVC pipes and requires less maintenance over time.
Overall, expansion PEX offers numerous benefits, making it an excellent choice for plumbing systems in residential and commercial buildings.
Expansion PEX in Heating Systems
Expansion PEX, also known as cross-linked polyethylene, is a valuable component in heating systems for its exceptional thermal expansion properties and durability. Here are a few key points to understand its significance:
- Flexibility: PEX pipes can flex and bend, making installation easier and enabling them to navigate around obstacles without the need for additional fittings.
- Resistance: PEX is highly resistant to scale build-up, corrosion, and freeze damage, ensuring long-term reliability.
- Expansion and Contraction: PEX pipes expand and contract significantly less than other materials, reducing the risk of leaks and damage during temperature fluctuations.
- Quiet Operation: PEX helps minimize water hammer noise due to its inherent flexibility and ability to absorb pressure fluctuations.
- Cost-effective: PEX offers cost savings due to its ease of installation, reduced need for fittings, and long-lasting performance.
Overall, Expansion PEX is a trusted solution in heating systems, providing flexibility, durability, and efficient operation.
Expansion PEX in Radiant Floor Heating
Expansion PEX (cross-linked polyethylene) is an essential component in radiant floor heating systems. It is designed to accommodate the expansion and contraction of the heated water that flows through the system, ensuring optimal performance and preventing damage. Here are key reasons why expansion PEX is crucial:
- Flexibility: Expansion PEX has excellent flexibility, allowing it to navigate through tight spaces and curves, making installation easier and more efficient.
- Durability: This type of PEX is highly resistant to cracking, corrosion, and scaling, ensuring long-term reliability and minimizing the need for repairs or replacements.
- Expansion capabilities: The unique cross-linking process of PEX allows it to expand and contract without compromising its structural integrity, accommodating the thermal expansion of the heated water.
- Leak resistance: Expansion PEX, when properly installed with appropriate fittings, provides a tight and reliable seal, minimizing the risk of leaks and water damage.
- Energy efficiency: By utilizing expansion PEX, radiant floor heating systems can deliver efficient heat distribution, resulting in energy savings and improved comfort.
In summary, expansion PEX plays a crucial role in ensuring the effectiveness, longevity, and efficiency of radiant floor heating systems.
Expansion PEX in Hydronic Systems
Expansion PEX plays a crucial role in hydronic systems, ensuring proper functioning and minimizing potential issues. Here are key points to understand:
Expansion PEX is a type of flexible piping made from cross-linked polyethylene. Its primary purpose is to accommodate the expansion and contraction of water within the hydronic system due to temperature variations.
Expansion PEX is highly durable and resistant to corrosion, making it ideal for hydronic applications. Its flexibility allows for easy installation and reduces the need for fittings and joints, decreasing the risk of leaks.
It absorbs the thermal expansion of the water as it heats up, which helps prevent pressure buildup and potential damage to the system.
Expansion PEX is commonly used in radiant heating systems, where heated water circulates through tubing embedded in floors or walls, providing efficient and even heat distribution.
Proper sizing and installation of expansion PEX are crucial to ensure optimal system performance. It’s important to follow manufacturer guidelines and consult with professionals experienced in hydronic systems.
Regular maintenance and monitoring of the expansion PEX is recommended to detect any signs of wear, damage, or leaks, ensuring the longevity and reliability of the hydronic system.
In summary, expansion PEX is an essential component in hydronic systems, enabling the safe and efficient operation of heating systems while accommodating thermal expansion.
Expansion PEX in Potable Water Systems
Expansion PEX is commonly used in potable water systems due to its excellent performance and benefits. Here are some key points:
- Flexibility: Expansion PEX pipes are highly flexible, allowing for easy installation in tight spaces and around obstacles.
- Resistance to corrosion: These pipes are resistant to corrosion, ensuring long-term durability and minimizing the risk of leaks.
- Expansion and contraction: PEX pipes have the ability to expand and contract, making them ideal for areas with temperature fluctuations, reducing the risk of bursting.
- Easy connections: Expansion PEX utilizes expansion fittings, which create a secure and leak-free connection without the need for any adhesives or soldering.
- Cost-effective: PEX pipes are cost-effective compared to traditional copper or PVC pipes, making them a popular choice for plumbing systems.
- Improved water flow: PEX pipes have a smooth interior surface, promoting better water flow and reducing pressure loss.
Overall, the use of Expansion PEX in potable water systems offers numerous advantages, including flexibility, corrosion resistance, and easy installation, making it a reliable choice for plumbing applications.
In conclusion, Type B PEX is indeed expandable, offering flexibility and ease of installation in various plumbing systems. Its cross-linked structure ensures durability and resistance to temperature and pressure fluctuations, making it suitable for both residential and commercial applications. The expansion method, commonly known as the Uponor or Wirsbo system, involves using an expansion tool to enlarge the PEX pipe diameter. This allows for secure connections with fittings, eliminating the need for traditional soldering or crimping techniques. The expandable nature of Type B PEX provides significant advantages, such as reduced installation time, fewer connection points, and increased reliability. When considering plumbing options, the expandability of Type B PEX makes it a versatile and reliable choice for a wide range of projects, providing a long-lasting and efficient plumbing solution.
Frequently Asked Questions
Q: Is Type B PEX expandable?
A: Yes, Type B PEX is expandable.
Q: What does ‘expandable’ mean in relation to Type B PEX?
A: Expandable refers to the ability of Type B PEX to expand and contract when subjected to temperature changes, making it a versatile option for various applications.
Q: What are the advantages of using Type B PEX over other types?
A: Type B PEX offers superior flexibility, resistance to bursting from freezing temperatures, and excellent resistance to chemical and mineral build-up.
Q: Can Type B PEX be used for both hot and cold water applications?
A: Yes, Type B PEX can be used for both hot and cold water applications. It has a high temperature rating, making it suitable for hot water systems.
Q: What types of fittings are compatible with Type B PEX?
A: Type B PEX is compatible with both crimp and clamp ring fittings, providing options for secure and reliable connections.
Greetings! I’m Ralph D. Moniz, your reliable PEX plumbing service provider. Stay updated on all things plumbing by exploring my PEX System blog. Just search “PEX System” on popular search engines like Google or Yahoo. Need assistance? Contact me at https://pexsystem.com/contact/.