How To Connect Galvanized Pipe To Pex

Joining dissimilar pipe Plumbing & HVAC
Joining dissimilar pipe Plumbing & HVAC from

How to Connect Galvanized Pipe to PEX


In this article, we will discuss how to connect galvanized pipes to PEX, a flexible plastic tubing commonly used for residential plumbing systems. Galvanized pipes, made of steel coated with zinc, were once widely used in plumbing. However, due to their susceptibility to corrosion and eventual leaks, many homeowners are now opting to replace them with PEX pipes, which are more durable and resistant to corrosion.

Materials Needed

1. PEX tubing

Make sure to choose the appropriate size for your plumbing needs.

2. PEX fittings

These fittings allow you to connect PEX tubing to other types of pipes or fixtures.

3. Galvanized-to-PEX transition fittings

These fittings are specifically designed to connect galvanized pipes to PEX tubing.

4. Pipe cutter

Used to cut the galvanized pipe to the desired length.

5. PEX crimping tool

This tool is necessary for securing the PEX fittings onto the PEX tubing.

Step-by-Step Guide

Step 1: Prepare the Galvanized Pipe

Using a pipe cutter, cut the galvanized pipe to the desired length. Ensure that the cut is clean and free from burrs or rough edges.

Step 2: Clean the Pipe

Use a wire brush to remove any debris or corrosion from the end of the galvanized pipe. This will help ensure a proper connection.

Step 3: Attach the Transition Fitting

Apply Teflon tape or pipe thread compound to the male threads of the transition fitting. Screw the fitting onto the end of the galvanized pipe tightly using a pipe wrench.

Step 4: Cut and Prepare the PEX Tubing

Measure and cut the PEX tubing to the desired length using a PEX cutter. Make sure the cut is straight and clean.

Step 5: Insert the PEX Fitting

Slide the PEX crimp ring onto the end of the PEX tubing. Insert the PEX fitting into the tubing until it reaches the shoulder of the fitting.

Step 6: Crimp the Ring

Using a PEX crimping tool, position the crimp ring in the appropriate groove of the tool and squeeze the handles firmly to crimp the ring onto the PEX tubing and fitting. This ensures a secure connection.

Step 7: Connect the PEX Tubing to the Transition Fitting

Insert the other end of the PEX tubing with the crimped fitting onto the transition fitting. Push the tubing until it stops, ensuring a tight connection.

Step 8: Test the Connection

Turn on the water supply and check for any leaks at the connection. If there are no leaks, the connection is successful.


Connecting galvanized pipes to PEX tubing is a relatively straightforward process. By following the steps outlined in this article, homeowners can replace their old galvanized pipes with more durable and corrosion-resistant PEX pipes. Remember to use the appropriate materials and tools for a secure and leak-free connection. If unsure, it is always recommended to consult a professional plumber for assistance.