How to Replace One Piece of Polybutylene Pipe

Polybutylene piping was commonly used in both commercial and residential water systems starting in 1978 and continuing up until 1995.

Replace One Piece of Polybutylene PipeReplace One Piece of Polybutylene Pipe
While no official report corroborates this, it is often believed that the pipe begins to break down over time and will become brittle and unstable if left in too long. If you have a water system with polybutylene pipe, chances are that you will eventually need to replace at least a section. Fortunately, this is not an especially difficult procedure.

Expose the pipe you need to replace, if necessary. This may require breaking through a wall or digging up a section of turf, depending on the pipe's location.

Cut through the desired section of pipe with a hacksaw or pipe cutter. Discard the old section of pipe.

Measure the appropriate length of replacement pipe. Make sure to shorten your measurements by an inch or two to account for the space for the pipe connectors you will need to install.

Apply PVC cement primer to the insides of both pipe connectors and allow to dry, then apply PVC cement to both pipe connectors.

Place the PVC connectors onto the polybutylene pipe left when you removed the first section. Give the connectors a half-twist to ensure a solid bond between the pipe and cement.

Cut out the needed length of replacement pipe and apply PVC cement to both ends.

Install the new pipe into the two connectors and give it a half-twist to ensure a solid bond.

Things You Will Need

  • Hacksaw or pipe cutter
  • Pipe connectors
  • Replacement pipe
  • Measuring tape
  • Marker
  • PVC cement primer
  • PVC cement


  • When you are done with the operation, your pipe system should look like this: Old Pipe - Connector - New Pipe - Connector - Old Pipe
  • You may need to bend the old pipe a little to get the new pipe into the connectors.


  • Turn off your water first, if the pipe is part of a water system, before attempting to do the replacement.

About the Author

Joshua Benjamin began as a professional freelance writer in 2009. He has successfully published numerous articles spanning a broad range of topics. Benjamin's areas of expertise include auto repair, computer hardware and software, firearms operation and maintenance, and home repair and maintenance. He is currently pursuing a Bachelor of Business Administration from California State University, Fresno.