Understanding PEX Plumbing
PEX tubing is color-coded—usually red, blue, and white—for easy identification of hot, cold, and general-use lines. PEX has significant resistance to scale buildup and chlorine corrosion when compared to traditional metal pipes.
Its flexibility allows for fewer joints and fittings, which lowers the risk of leaks and adapts well to tight spaces or unusual layouts. PEX is commonly used in both new constructions and retrofitting projects, making it a trusted choice for professionals in the field.
Advantages of Using PEX Fittings
PEX systems offer cost savings and design flexibility for installers and trades professionals.
Lower Costs and Long-Term Value
PEX fittings are generally more affordable than traditional options and are designed to withstand high temperatures and chemicals, which reduces the need for repairs or replacements.
Installation Flexibility
PEX tubing’s flexibility means you need fewer connections, which streamlines setup and cuts down on labor time.
Types of PEX Fittings
Supplyhouse provides six primary types of PEX connections, each designed to work with specific tubing and tool sets.
Crimp Fittings
Crimp fittings use copper rings and a crimping tool that has interchangeable heads for different sizes. This method offers a budget-friendly, secure connection for standard PEX. However, crimp fittings are not suitable for PEX-AL-PEX. To learn more, check out our comparison of PEX Crimp vs. PEX Clamp systems: https://blog.supplyhouse.com/pex-crimp-vs-pex-clamp/
Clamp Fittings
Clamp fittings employ stainless steel clamps that are secured with a single clamp tool, which simplifies the installation process and only requires the ring and fitting size to change. For more information on how clamp systems stack up: https://blog.supplyhouse.com/pex-crimp-vs-pex-clamp/
Expansion Fittings
Expansion fittings are designed for use with PEX-A tubing and need a specialized expansion tool. Although this tool requires a larger initial investment, it eases installation strain and boosts efficiency on the job. Many contractors prefer the Uponor ProPEX system: https://blog.supplyhouse.com/why-you-should-be-using-uponors-propex-system/
Press Fittings
Press fittings come with pre-attached sleeves and are installed using specific press tools. These tools can be purchased individually or as part of bundled kits. Learn more here: https://blog.supplyhouse.com/your-guide-to-pex-press-fittings/
SharkBite Fittings
Push-to-connect fittings like SharkBite allow for tool-free installation, making them perfect for quick repairs or smaller tasks. While they’re convenient, they tend to be pricier per fitting compared to other methods.
Compression Fittings
A three-piece threaded fitting setup makes compression fittings ideal for manifold connections and applications that require flexibility. No special tools are needed for assembly.
Material Choices for PEX Fittings
The choice of material affects both performance and durability. Brass and poly-alloy are the most commonly used materials in PEX fittings.
Brass Fittings
Brass fittings are known for their high durability and heat resistance, making them effective in hot water lines. However, certain water conditions can lead to corrosion over time.
Poly-Alloy Fittings
Constructed from corrosion-resistant plastic, poly-alloy fittings provide long-lasting performance in environments with aggressive water. They also offer a more cost-effective solution.
Looking for a reliable option? Bluefin PEX fittings deliver excellent performance and value: https://blog.supplyhouse.com/bluefin-pex-fittings/
Tools Required for PEX Fittings
The tools you may need depend on the system. Crimp and clamp systems require their specific tools, and a go/no-go gauge is crucial for confirming crimp accuracy.
Measuring, cutting, and deburring tools all aid in accurate preparation and cleaner assembly.
Maintaining a Secure Connection
Reliable PEX connections begin with correct fitting placement and consistent pressure application. Always check the alignment before assembly and avoid using excessive force to prevent damaging the material.
A pressure test after installation can confirm the strength of each joint and highlight any areas that may need correction.
Residential Plumbing
PEX tubing is frequently used for hot and cold water in residential supply lines. The reduced number of joints simplifies installation and minimizes potential leak points.
Radiant Floor Heating
PEX is particularly well-suited for radiant heating because of its high-temperature tolerance and flexibility. It installs quickly and supports even heat distribution throughout a floor system.
PEX-AL-PEX Applications
For situations that require reduced expansion and added rigidity, PEX-AL-PEX tubing is often the choice. Fittings must be compatible with the aluminum layer—learn more here: https://blog.supplyhouse.com/fittings-for-pex-aluminum-pex/
Selecting the Right PEX Fittings for a Project
Choosing the right fitting type and material depends on the tubing type (PEX-A, PEX-B, or PEX-C), system pressure, and specific job requirements. Always verify compatibility and proper pressure ratings.
Careful selection leads to better performance and lowers the risk of issues after installation.
Common Mistakes and Troubleshooting
Common mistakes include mismatched tools or fittings and uneven cuts on tubing. All cuts should be square and clean, as jagged edges can hinder proper sealing.
Checking connections during and after assembly helps catch small errors before they escalate into larger system problems.
