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How To Connect PEX Tubing

PEX tubing (Figure 1) and its associated connectors (Figure 2), adaptors, fittings, couplings and valves require a few special tools in order to make water tight joints between connections. Trying to make proper connections between tubing and connectors, adaptors, fittings, couplings and valves is foolish and will only lead to leaks within the piping system.

PEX tubing

Figure 1 - PEX tubing

PEX female tubing fitting

Figure 2 - PEX female tubing fitting

As with most tools there are professional grade and home handyman grade.

Specially designed fittings must also be used to ensure a watertight system.

  • In order to transition from other piping materials such as steel, PVC, CPVC and copper specially designed adaptors are available. fittings are available to connect PEX to steel, copper, PVC, and CPVC.
  • Tip: Always connect the adapter fitting to the steel, copper, PVC, or CPVC pipe before connecting it to the PEX tubing.

    Tip: Be careful when connecting different metals together or you will create a situation where you have galvanic corrosion between the metals.

  • Use the specially designed PEX tubing cutting tool (Figure 3) to ensure a clean, square cut.
  • PEX tubing cutter

    Figure 3 - PEX tubing cutter

    When purchasing a PEX tubing cutter make sure that it can handle the tubing sizes that you will be using on your project.

  • Using a specially designed PEX crimping tool, crimp the ring in position.
  • PEX tubing crimping tool

    Figure 4 - PEX tubing crimping tool
  • To ensure that the tubing has been properly crimped to the fitting, adapter, coupling or valve you can check it with a Go-No-Go gauge (Figure 5).
  • PEX tubing Go-No-Go gauge

    Figure 5 - PEX tubing Go-No-Go gauge
  • The gauge has openings for the most common pipe sixes. If the crimp does not meet the standards of the Go-No-Go gauge, the joint should be taken apart and re-done.