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How To: Replace A Ballcock And Float Valve

What you will need

  • New Ballcock and Float Valve for toilet
  • Pipe wrench
  • Water pump pliers


Click here to view PDF.

  • 1 Remove the lid from the top of the cistern of the toilet and set aside in a safe place. Top Tip: Bring the broken unit with you to Woodie’s and match up the new one with the broken one.
  • 2 Turn off the cold water supply usually found in the hot press. Flush the toilet to drain the cistern.
  • 3 Use the water pump pliers to unscrew the float arm and float from the old float valve unit and remove.
  • 4 Then use a sponge to soak up any extra water inside the cistern.
  • 5 Locate the coupling nut under the cistern. It will be where the water inlet pipe enters the base of the cistern. Unscrew the nut and free the pipe. Place a towel and bucket on the ground to catch any extra spillages.
  • 6 Use an adjustable wrench to grip the retaining nut (found above the coupling nut)
  • 7 Then hold the base of the ballcock float valve inside the tank. Unscrew the nut under the tank and remove the old float valve.
  • 8 Replace with the float valve. Tighten the nut on the outside taking care to keep the washers in place.
  • 9 Then replace the coupling nut and water inlet pipe.
  • 10 Finally, replace the float ball.
  • 11 Turn the water back on and check for leaks at all points.
  • 12 Check that the float ball doesn’t rub against the back of the tank.
  • 13 Also check that the cistern fills to the water line – you may have to adjust the nut at the base of the float arm
  • 14 Test the toilet by flushing it wait until it fills and then put the lid back on the cistern.