How to Cap Plumbing Supply Lines

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Many times old plumbing fixtures are removed and not replaced with new ones. A sink may be moved or a basement fixture may no longer be needed. The water supply lines to which the fixture was attached must be capped properly to make sure they don't leak. By performing the procedure correctly, you will ensure that the caps will provide years of worry-free service.

Things You'll Need

  • Steel wool
  • Threaded plumbing caps
  • Teflon tape
  • Slip-joint pliers (2 pairs)
  • Clean the threads on the water supply lines with steel wool. Removing dirt and debris from the threads will help when connecting the cap to the supply line.

  • Wrap the threads on the supply line with Teflon tape to help seal the connection and prevent leaking. Wrap the tape around the threads clockwise so it does not come off as the cap is being installed.

  • Thread the cap onto the supply line by hand clockwise a couple of turns to ensure it does not become cross-threaded.

  • Grasp the supply line with a pair of slip-joint pliers and hold it firmly. Use another pair of slip-joint pliers to turn the cap clockwise until it is tight.

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