how to connect non threaded galvanized pipe to pex

Daniel Parker

3 min read

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15-01-2025

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Connecting non-threaded galvanized pipe to PEX plumbing requires a transition fitting because these materials have different connection methods. Galvanized pipe uses threaded connections, while PEX uses crimp rings or expansion fittings. This guide will walk you through the process safely and effectively.

Understanding the Materials

Galvanized Steel Pipe: This durable metal pipe is known for its strength and longevity. However, its threaded connections can be challenging to work with, especially in older systems where corrosion might be a factor. For PEX connections, you'll need a fitting that adapts from the galvanized pipe's unthreaded end to a PEX compatible connection.

PEX (Cross-Linked Polyethylene): A flexible plastic pipe popular for its ease of installation and resistance to corrosion. PEX connections typically involve crimp rings and a crimping tool, or expansion fittings and an expansion tool. We'll focus on the crimp method in this guide.

Tools and Materials Needed

Before you begin, gather the necessary tools and materials. Improper tools can lead to leaks and system failure.

• Transition Fitting: This is the crucial component. You'll need a fitting that converts the unthreaded galvanized end to a PEX fitting. Common options include a galvanized to PEX adapter. Ensure the fitting is rated for the water pressure in your system.
• PEX Pipe Cutter: For precise cuts on the PEX tubing.
• PEX Tubing: Use the appropriate diameter to match your existing plumbing system.
• Crimp Rings: These are essential for securing the PEX to the fitting. Select rings specifically designed for your chosen fitting and PEX tubing size.
• Crimping Tool: A high-quality crimping tool is crucial for a leak-proof connection. A poorly crimped connection is a major cause of leaks.
• Deburring Tool: This tool removes any sharp edges from the cut PEX tubing, preventing damage to the crimp rings or leaks.
• Pipe Wrench: To help remove any existing fittings or to support the galvanized pipe during the installation process.
• Measuring Tape: Ensure accurate measurements when cutting the PEX tubing.
• Safety Glasses: Always protect your eyes when working with tools and plumbing.

Step-by-Step Guide: Connecting Non-Threaded Galvanized Pipe to PEX

1. Prepare the Galvanized Pipe: Clean the end of the galvanized pipe thoroughly. Remove any debris, rust, or loose material that could interfere with the connection.

2. Install the Transition Fitting: Securely attach the galvanized to PEX adapter to the end of your galvanized pipe. Use a pipe wrench to avoid damaging the fitting or the galvanized pipe. Ensure a tight and secure seal.

3. Measure and Cut the PEX Tubing: Measure the required length of PEX tubing. Add extra length to allow for adjustment during installation. Use your pipe cutter to make a clean, square cut on the tubing.

4. Deburr the PEX Tubing: Using a deburring tool, carefully remove any sharp edges or burrs from the cut end of the PEX tubing. This helps create a smooth surface for the crimp ring to grip.

5. Insert the PEX Tubing and Crimp Ring: Slide the crimp ring onto the PEX tubing. Then, carefully insert the PEX tubing into the transition fitting until it is fully seated.

6. Crimp the Connection: Using your crimping tool, firmly crimp the ring according to the manufacturer's instructions. This creates a secure and leak-proof connection. Ensure the crimp is even and properly secured. An improperly crimped connection is the most common cause of failure.

7. Test for Leaks: After completing the connection, test for any leaks. Turn on the water and carefully inspect the connection for signs of leakage. If a leak occurs, the connection was improperly crimped or the fitting is not rated for your water pressure. You may need to start again using a correctly sized and rated fitting.

Troubleshooting and Safety

• Leaks: If you experience leaks, check the crimp ring for proper seating. It might need to be re-crimped, or you may need to replace the fitting.

• Incorrect Fitting: Using the wrong size or type of transition fitting is a major cause of issues. Double-check compatibility.

• Safety First: Always turn off the water supply before beginning any plumbing work. Always wear safety glasses to protect your eyes.

Connecting non-threaded galvanized pipe to PEX can seem daunting, but by following these steps and using the right tools, you can achieve a secure and reliable connection. Remember, if you’re uncomfortable performing this task yourself, consult a qualified plumber.