How to Join a CPVC Pipe to a Galvanized Metal Water Pipe

Written by ian kelly
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How to Join a CPVC Pipe to a Galvanized Metal Water Pipe
Joining CPVC tubing to galvanised pipe without solder or glue is possible. (plumbing image by Inger Anne Hulbækdal from

Because of the escalating price of copper, chlorinated polyvinyl chloride (CPVC) pipe has gained wide acceptance as an alternative to copper tubing in the plumbing industry. However, CPVC in turn is now being replaced by cross-linked polythene pipe (PEX) as the leading alternative to copper. To cater to the growing popularity of plastic tubing, the Cash Acme and Probite companies have developed a push-fit connection system for joining any combination of plastic, galvanised and copper pipe together.

Skill level:

Things you need

  • Pipe vice
  • Threading pipe die
  • Motor oil
  • Teflon plumber's tape
  • Sharkbite female threaded adaptor
  • Wrench
  • Plastic pipe cutter
  • Sharkbite push-fit connector

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  1. 1

    Thread galvanised pipe with a rented pipe vice and threading pipe die to match the size of the pipe. Clamp the pipe in the pipe vice. Lubricate the end with motor oil and push the threading die over the galvanised pipe. Push in and rotate the die by turning the handles clockwise until you have 3/4-inch of thread on the end of the pipe. Remove the die by turning the handles counterclockwise. Wipe the threads clean.

  2. 2

    Wrap a layer of Teflon plumber's tape clockwise around the galvanised pipe. Stretch the tape until it settles into the thread profile. Continue stretching the tape over the threads with spiral turns overlapping half the width of the tape until the threads are covered. Stretch the end until the tape breaks. Smooth the edges of the tape into the threads. Thread a correct size Sharkbite female threaded adaptor over the taped thread on the galvanised pipe. Tighten the adaptor with a wrench. The other end of the fitting is a fixed tube machined to match the diameter of the CPVC tubing.

  3. 3

    Cut the end of the CPVC with a plastic pipe cutter. Make sure that the pipe is cut squarely. Push the CPVC into an appropriate size Sharkbite push-fit connector. Press the pipe inward until you feel the fitting clamp ring inside the connector lock into place. Insert the machined tube of the female threaded adaptor into the push-fit connector until it locks into place. This will form a pressure-tight connection between the galvanised pipe and the CPVC tubing.

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