How to Install Compression Fittings on a 1/4 Water Line


Compression fittings allow you to make a plumbing connection without using solder. A ¼- inch water line supplies the water to appliances such as an icemaker in a refrigerator. A compression fitting generally makes this connection. The compression fitting consists of three parts: the compression nut, ring and seat. Most people can install a compression fitting on a ¼- inch water line with just a few basic tools.

Things You'll Need

  • ¼ inch plastic or copper water line
  • Compression nut
  • Compression ring
  • Compression seat
  • Wrench set
  • Slide the compression nut onto the ¼-inch water line. The threads should be facing towards the open end of the line.

  • Slide the compression ring onto the water line. The water line must protrude at least 1/8 of an inch beyond the compression fitting. You must use a plastic compression fitting if you are using a plastic water line. Check with your local hardware store to ensure that your fittings are compatable with your water line.

  • Connect the compression nut to the threaded male water intake compression seat. The last couple of inches of the water line must be straight. A bend can result in a water leak. Turn the compression nut by hand clockwise on the threaded water intake tube. Tighten the compression nut with a wrench. Do not over tighten the nut.

  • Turn the water valve on. Check for leaks.

Tips & Warnings

  • Make sure that the water line extends far enough beyond the compression ring to extend into the water intake.
  • Leave extra length on the water line to allow for movement of the appliance. If the water line is too short you can spring a leak when you move the appliance.
  • Watch for leaks. Compression fittings can develop very slow water leaks.

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