Connecting Copper Pipes to PEX: A Comprehensive Guide

Introduction

When it comes to plumbing, connecting copper pipes to PEX (cross-linked polyethylene) tubing is a common task. Properly connecting these dissimilar materials requires the use of specialized transition fittings. This article will explore various methods and tools to help you achieve a secure and effective connection, while adhering to local plumbing codes and best practices.

Methods for Connecting Copper to PEX

Push-to-Connect Compression or Crimp Adapters

One of the most straightforward methods involves the use of push-to-connect compression or crimp adapters. These fittings allow for a quick and easy connection:

Clean the copper pipe thoroughly. Insert the copper pipe into one end of the adapter. Secure the PEX tubing to the other end using a crimp ring or a push-to-connect mechanism.

Ensure that the connection complies with local plumbing codes, and consider using a dielectric union to prevent corrosion when connecting dissimilar metals.

Threaded and Crimp Fittings

Another approach involves using a threaded or crimp transition fitting:

Turn off the water source and cut the copper pipe cleanly. Debur the ends of the copper pipe to ensure a smooth surface. Insert the pipes into the fitting according to the manufacturer's instructions. For crimp fittings, use a crimp tool to secure the connection.

Always check local plumbing codes for compliance to ensure a safe and legal installation.

Sweating an Adapter to Copper

A more permanent and solder-based approach involves sweating an adapter to the copper pipe and accepting the PEX pipe:

Buy a special tool for soldering (usually around $300). Solder a brass PEX A adapter to the copper pipe. Insert a sleeve onto the PEX pipe. Expand and push the PEX pipe into the adapter.

This method provides a robust and durable connection, ideal for professional installations.

Using SharkBite Couplings

DIY enthusiasts might prefer the ease of SharkBite couplings, which are specifically designed for quick and easy connections:

SharkBite fittings are available in many local hardware stores and home centers. These fittings are often used in emergencies but can be reliable if installed correctly.

For a more skilled approach, professionals can use press-to-copper couplings, which require a Pro Press tool and appropriate jaws to attach.

Conclusion

Connecting copper pipes to PEX is an essential task in modern plumbing systems. Whether you choose a push-to-connect, crimp, sweat, or SharkBite coupling, there are many methods available. Always ensure that the connection complies with local plumbing codes and that you use the correct fittings for your specific project. Properly connecting these materials will ensure a safe and long-lasting plumbing system.