Can I Use Regular PEX Fittings on Expansion PEX?
Cross-linked polyethylene (PEX) has completely changed the plumbing industry through elasticity, non-corrosiveness of the medium, and easy installation of the pipes. Still, one of the issues that may arise whenever there are new types of PEX tubing and different kinds of connections for this pipe is compatibility. Therefore, one should ask if it is possible to employ regular fittings for the expansion PEX. This article discusses some specifics of PEX fittings, the function of the PEX expander tool, and the compatibility of standard PEX fittings and the expansion PEX so that you can decide which PEX fitting to use in your plumbing exercises.
Types of PEX Tubing
PEX tubing comes in three main types, each with unique characteristics:
- PEX-A: It can be described as the most universal material with excellent elasticity and will revert to its size even when distorted more than once. It can also significantly increase and decrease depending on the weather conditions; therefore, it is suitable for winter.
- PEX-B: Slightly less flexible and even cheaper compared to PEX-A. This material commonly finds application in diverse plumbing procedures.
- PEX-C: The least flexible of the three but is adequate for most plumbing-related tasks. In contrast to PEX A and PEX B, it is relatively less frequent.
Read more: How Do I Know If I Have PEX A or PEX B?
Connection Methods for PEX
Several methods exist for connecting PEX tubing, each with its tools and fittings:
- Expansion Method: A PEX expander tool, such as the iCrimp Expanding Tool, pulls or expands the PEX pipe to fit the ends of a fitting before it releases and collapses to create a tight grip on the fitting. This method is mainly for PEX-A.
- Crimp Method: A crimper, copper, or stainless-steel ring like the iCrimp Angle PEX Crimper holds the fitting in place of the pipe. All types of PEX can use the method.
- Cinch (Clamp) Method: Involves using fittings made of stainless steel, which fits using a cinch tool and stainless-steel clamps. It is also compatible with all forms of PEX.
- Push-Fit Method: No special tools are needed; it Involves the insertion of the fittings into the pipe. For example, the iCrimp PEX Push-to Connect Fitting suits all PEX types.
What is a PEX Expander Tool?
The PEX expander tool, referred to as the PEX expansion tool, such as the iCrimp PEX Expansion Tool, is best used when working on a PEX-A tube. This tool enlarges the end of the PEX pipe to fit a fitting on it. The pipe then returns to its standard dimension, with the compression of the rubber seals, and the ring offers a tight and leak-proof grip on the fitting. This method capitalizes on the flexibility and shape memory attribute of PEX-A.
Advantages of a PEX Expander Tool
- Secure Connections: The expansion method forms very secure, tight joints that are not likely to leak.
- Flexibility: Another clear advantage of PEX-A is that its flexibility makes it easier to lay it in confined areas and near corners.
- Consistent Seals: What you get from the expander tool is uniformity and reliability in terms of the joints you get to make.
Can You Use Regular PEX Fittings on Expansion PEX?
Crimp or cinch-type ordinary PEX fittings are incompatible with the expansion method used for PEX-A type pipe. Here's why:
- Fitting Design: Expansion PEX fittings are unique for the expansion method since they focus on the pipe's ability to expand and then contract over the fitting.
- Material Properties: Normal PEX fittings may not suitably provide for expansion and contraction and, therefore, may cause leaks and failure.
- Seal Integrity: Most of the fittings' forms with an expansion method do not withstand pressure stresses, potentially affecting the seal's optimum efficiency when combined with regular fittings.
Read more: Best Fittings for PEX Pipes
The Best Practices for Using Expansion PEX
To ensure the best results with PEX-A tubing and the expansion method, follow these best practices:
- Use Compatible Fittings: It is also essential to point out that fittings must be for the expansion method in the case of PEX-A tubing. These fittings suit the requirements of PEX-A that have differently suitable characteristics.
- Proper Pipe Preparation: Take pictures or mark the pipe ends before cutting to visually document if they are two flush and well-aligned as they will never be perfect again after cutting and before deburring to check for any debris present before the expansion process.
- Correct Tool Usage: Involves using a high-quality PEX expander tool, and the user must be familiar with the same for effective expansion and contraction of PEX.
- Inspect Connections: After expansion and fitting insertion, check connections to see that they have been well-fixed and have no leaks.
Final Thought
When using PEX-A tubing and the expansion method, proper fittings have to be used every time for this application. Standard PEX fittings commonly applied with crimp or cinch techniques are incompatible with expansion PEX, resulting in seal compromises and possible leakage. With an update and compliance with best practices, suitable equipment, and fittings, the PEX-A plumbing installations are secure, stable, and last longer. Are you set and ready to go for your PEX plumbing project? Use the correct tools and fittings from iCrimp for the activity.
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