How to Use Galvanized Pipe With PEX

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Tighten the adapter to the galvanized pipe using a crescent wrench.
Tighten the adapter to the galvanized pipe using a crescent wrench. (Image: Thomas Northcut/Photodisc/Getty Images)

PEX, or cross-linked polyethylene pipe, is used to install water supply lines in the home. Due to its flexibility, it requires far fewer 90-degree fittings than copper or PVC supply pipe, and no cement or soldering is required in the installation. Joining galvanized pipes to a new PEX supply line requires a clamp ring connection adapter. This adapter has a female threaded inlet on one side for the galvanized pipe, and a male barbed end on the other to connect the PEX line.

Things You'll Need

  • Steel brush
  • White sealing tape
  • Crescent wrench
  • PEX tubing
  • PEX clamp ring
  • Clamp ring connection adapter
  • Stainless steel clamp ring crimping tool

Clean the threaded end of the galvanized pipe to which the PEX line will connect, using a steel brush. Wrap white sealing tape twice clockwise around the galvanized thread. Screw the female end of the adapter onto the thread, by hand. Tighten the adapter to the galvanized pipe using a crescent wrench.

Slide a PEX clamp ring over the end of the PEX tubing, and push the tubing over the barbed male end of the adapter. Make sure the barbed male end is fully inside the PEX tubing.

Push the clamp ring toward the adapter so that it sits over the middle of the barbed male end. Fit the side of the clamp ring into the jaws of a stainless steel clamp ring crimping tool. Make sure the tool's handles open. Squeeze the tool's handles together to tighten the ring. This will seal the PEX tubing to the adapter.

Tips & Warnings

  • Make sure the clamp ring is positioned halfway over the adapter's barbed male end before using the crimping tool, ensuring that the tightened ring creates a watertight seal.

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