Is It Safe to Use PEX B Fittings on PEX A Pipes?
PEX (cross-linked polyethylene) has become a popular piping choice in residential and commercial plumbing over the years due to its high flexibility, durability, and ease of installation. PEX A (known for superior flexibility and thermal memory) and PEX B (more rigid than PEX A) are among the common types of PEX tubing used in plumbing in most plumbing applications. Each of these PEX pipes uses a unique kind of fittings.
Can You Use PEX B Fittings on PEX A Pipe?
This is one of the commonly asked questions when dealing with PEX pipes. The general answer is YES: PEX B fittings can be used with PEX A pipes, especially in residential applications, which offer flexibility in installation options.
However, you cannot use PEX A fittings on PEX B pipe: PEX A fittings rely on expansion and contraction of the pipes for a secure connection, and PEX B is quite rigid and has a poor shape memory.
Read more: Can I Use PEX Crimp on Copper Pipe?
Key Considerations When Connecting PEX B Fittings to PEX A Pipe
1. Compatibility
PEX B fittings can be used with PEX A and PEX B pipes to create secure connections. These fittings include the crimp, clamp, and push-to-connect fittings. However, using PEX B fittings on PEX A pipes can sometimes be challenging and requires proper attention and tools to ensure proper connection. Above all, you should ensure that the fittings used match the temperature and pressure rating of the PEX A pipe.
2. Performance
PEX B fittings are made explicitly for PEX B pipes, and PEX A fittings are specifically for PEX A pipes. Therefore, the performance of PEX B fittings on PEX A pipes may be affected.
For instance, PEX B fittings have a slightly smaller diameter than PEX A fittings; thus, when used on PEX A pipes, it may affect water flow and pressure, especially in high-demand applications like multi-unit buildings. Also, an improper connection between PEX B fittings and PEX A pipe may lead to leakages due to differences in molecular structure.
3. Manufacturer’s recommendation
While most manufacturers approve that PEX B fittings can be used on PEX A pipes, it’s vital to refer to the manufacturer’s recommendation for compatibility and installation practices. Looking at the manufacturer’s recommendations will also help you avoid voiding the warranties as a result of using mismatched fittings.
4. Local codes and regulations
Plumbing codes and regulations vary from jurisdiction to jurisdiction, and some areas might have specific requirements regarding the types of fittings used in PEX piping systems. Therefore, checking local codes and regulations is essential to remain compliant. Consequently, you won’t have to deal with potential legal consequences or failed inspections.
Final Thought
Generally, you can use PEX B fittings on PEX A pipes. However, following the best plumbing practices is crucial to creating secure and leak-free connections. Above all, using the correct fittings on the right type of PEX tubing will give you optimal performance in a plumbing system and easily adhere to local building codes.
Another important aspect when working with both PEX A and PEX B fittings and pipes is using the proper tools. iCrimp is the go-to online store for all types of PEX crimping, clamping, and expansion tools. Our tools feature great user-friendly designs, quality build, and affordability.
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