How to Install Polyethylene Tubing for Water

Polyethylene tubing is a durable, flexible material for use in plumbing systems. Because the material can withstand temperature extremes both hot and cold, it can be used to connect plumbing fixtures to the household water supply, as well as to dishwashers, washing machines and other appliances. Polyethylene tubing is typically sold in coils and cut to the required length. Use a crimping tool to attach compression fittings on each end so the tubing can be connected to standard plumbing fixtures.

Retractable knife or cutting blade
Crimping tool
Connector fittings
Pliers

Instructions

- 1
  Turn the water supply knobs clockwise until tight to shut off the water for the connection you plan to make.
- 2
  Uncoil a length of polyethylene tubing to span the distance between your connections, such as from the kitchen faucet piping below the sink to the inlet valve on a dishwasher. The tubing must not be taut between the connections because this can cause strain and stretching that may eventually result in leaks. For best results, add 4 inches to the length of tubing to give it some flexibility.
- 3
  Place the edge of the knife or cutting tool at a 90-degree angle to the tubing and cut downward, making as straight an edge as possible.
- 4
  Push a connector fitting completely into the tubing at both open ends.
- 5
  Open the crimping tool in the same manner as pliers. Fit the curved ends of the tool over the tubing where the connector fitting is inserted.
- 6
  Squeeze the handles of the crimping tool to the closed position. This seals the connection between the fitting and the polyethylene tubing.
- 7
  Twist the connector on each end to the threaded pipes for the water line, turning the connectors to the right until tight.
- 8
  Open the water valves by twisting the knobs to the left. Stop any minor leaks at the connectors by turning clockwise with pliers.

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