How to Install a Toilet Ballcock

Written by kenneth crawford
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How to Install a Toilet Ballcock
(Jupiterimages/ Images)

Many toilets still use a ballcock fill valve to provide water to the toilet tank. The ballcock uses a float ball on the end of a rod. The rod attaches to the top of the ballcock, which shuts off the water when the toilet tank is full. Ballcocks are susceptible to leaks strictly by their design. Take the old one with you when you buy a new one so you get the proper size. The key to installing a ballcock is positioning the float arm behind the flush valve. Ballcock kits are available at home improvement centres.

Skill level:

Things you need

  • Slip-joint pliers
  • Plumber's tape

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  1. 1

    Slide a rubber cone washer over the threaded end of the new ballcock with the angle of the washer pointing away from the ballcock. Insert the threaded end of the ballcock through the hole in the bottom of the toilet tank. Turn the ballcock as necessary so the stem for the float ball rod is pointing toward the flush valve.

  2. 2

    Slide the flat rubber washer that comes with the kit over the threads of the ballcock protruding through the toilet tank. Thread the retaining nut over the threads until the nut makes contact with the washer.

  3. 3

    Thread one end of the float arm into the threaded stem sleeve on the top of the ballcock. The float arm should pass between the rear of the toilet tank and the flush valve. Thread the float ball on the opposite end of the float arm.

  4. 4

    Insert the refill tube over the port on the top of the ballcock. Insert the other end of the hose into the metal retaining clip that comes with the kit. Position the end of the hose into the side of the flush tube, using the clip to secure the hose to the tube.

  5. 5

    Tighten the retaining nut under the toilet tank with slip-joint pliers. Wrap the threads of the ballcock with plumber's tape. Thread the water line connector to the threads on the ballcock and tighten with the slip-joint pliers. Turn on the water supply valve to fill the toilet tank. Flush the toilet to test the ballcock and check for leaks.

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