How to Crimp PEX

Making the perfect PEX pipe crimp connection is a matter of taking your time and doing the job right. It only takes a few seconds to line up and crimp a joint; take the time to line up the crimping tool properly as well. Mistakes are all too common when installing the PEX piping system. When all else fails, read the instruction manual that comes with the crimping tool.

PEX is flexible piping that can be used for home plumbing.
  1. Cut the pipe end as square as possible with a PEX tubing cutter. The pipe end must be free of burrs and debris for a perfect fit.
  2. Use the correct crimp tool for the ring. Each crimp ring design is made to work with only one tool.
  3. Slide the crimp ring up to 1/8 inch away from the fitting. There must be 1/8 to 1/4 inch of pipe showing at the end of the crimp.
  4. Hold the crimp tool at a 90-degree angle over the ring. This may mean you will need to adjust your physical position to accurately crimp the ring.
  5. Cover the entire crimp ring with the tool's jaws before making the joint. Take your time and line up the tool over the whole ring and make the connection. Test each crimp with a Go/No-go gauge from the manufacturer by fitting the appropriate openings over the crimp to test its width.

Things You Will Need

  • PEX tubing cutter
  • Crimping tool
  • Go/No-go gauge


  • Not following all the manufacturer's installation instructions will eventually lead to leaks.


  • Leaking crimp joints may cause serious property damage.

About the Author

Kelly Schuler is both a writer and a plumber. He self published "Plumbing Do's and Dont's" in 1999. Schuler has been a licensed plumbing and gas-fitting contractor since 2001 and a licensed journeyman plumber since 1986. He actively owned and operated his own plumbing and gas fitting business from 2001 to 2008.

Photo Credits

  • Semi round pattern form by rubber pipe. image by BengLim from Fotolia.com