There are a couple of common ways to connect PEX (cross-linked polyethylene) tubing to copper pipes: crimping with adapters, or soldering an adapter and then crimping.
Methods for Connecting PEX to Copper
Here are the two main methods, based on the provided reference:
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Using Crimp Fittings:
- Obtain a PEX-to-copper adapter. This adapter will have a copper end that connects to the copper pipe and a PEX end that accommodates PEX tubing.
- Slide a crimp ring (made of copper or stainless steel) onto the PEX tubing.
- Insert the PEX tubing onto the PEX end of the adapter.
- Position the crimp ring so that it's properly seated over the barb of the fitting.
- Use a PEX crimping tool to compress the crimp ring, creating a secure connection. Ensure the crimper is positioned correctly for a proper crimp.
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Soldering a Threaded Copper Adapter and Crimping:
- Solder a male or female threaded copper adapter onto the existing copper pipe. This requires soldering skills and equipment. Make sure the adapter's threads match the PEX adapter you'll use.
- Attach a matching PEX adapter (with corresponding male or female threads) to the soldered copper adapter.
- Crimp the PEX tubing onto the PEX end of the adapter, using the same crimping process described above (crimp ring, proper positioning, and crimping tool).
Important Considerations:
- Code Compliance: Always check your local plumbing codes to ensure that the chosen method and materials comply with regulations.
- Proper Tools: Using the correct PEX crimping tool and following the manufacturer's instructions are crucial for a leak-proof connection.
- Soldering Skills: If you choose the soldering method, ensure you have the necessary skills and safety equipment to solder copper pipes correctly. If you are uncomfortable soldering, consider hiring a qualified plumber.
- Deburring: Before connecting PEX to a fitting, deburr the inside and outside of the PEX tube to ensure a smooth, leak-free connection.
- Fitting Compatibility: Verify that the PEX fittings are compatible with the type of PEX tubing you're using (e.g., PEX-A, PEX-B, PEX-C).
- Pressure Testing: After completing the connection, it's recommended to pressure test the plumbing system to identify any leaks before concealing the pipes.
