How to Install Compression Rings on Vinyl Plastic Tubing

Written by richard asmus
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Highly flexible vinyl plastic tubing serves many purposes for your small water volume plumbing needs. Use it for an ice maker or a small plant watering system. Its smooth surfaces never corrode, and prevent the build-up of any bacterial growth, either inside or outside of the tubing. To install a fitting on the end of the tubing, you need a compression ring commonly called a ferrule. Use a plastic ferrule and never brass, which could dig into the tubing and cause a leak.

Skill level:
Moderately Easy

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Things you need

  • Knife
  • Brass compression nut
  • Plastic compression ring (ferrule)
  • Brass insert adaptor
  • Brass compression fitting
  • 2 adjustable wrenches

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  1. 1

    Cut the vinyl tubing with the knife. Cut it at a straight 90 degree angle.

  2. 2

    Slide the brass compression nut onto the tubing.

  3. 3

    Slide the plastic compression ring over the tubing.

  4. 4

    Insert the brass insert adaptor into the plastic tubing. Push it all the way in until the tubing is flush with the collar at the end.

  5. 5

    Insert the tubing into the brass compression fitting.

  6. 6

    Screw the nut onto the fitting until it is hand tight.

  7. 7

    Hold the body of the fitting with one wrench and tighten the nut with the other.

Tips and warnings

  • Do not try to install the compression ring without the insert adaptor. The tubing will collapse and will not make a seal.

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