How to Convert to a Dual-Flush Toilet

Written by chris passas
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Dual-flush conversion kits can be retrofitted to an existing two-piece front-handled toilet and are compatible with most fill valves. The flush mechanism is the only part of the toilet to replace. It features two handles: a small handle for flushing liquid waste and a large handle for flushing solid waste. By using the small handle, the toilet flushes half the amount of water used with a standard flush mechanism, thus conserving water and saving money. The large handle still flushes the same amount as a standard handle.

Skill level:

Things you need

  • Dual-flush conversion kit
  • Flat-head screwdriver
  • Saw
  • Glue
  • Channel-lock pliers
  • Utility tub or bucket
  • Rags or paper towels

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  1. 1

    Shut off the water supply to the toilet tank and flush the toilet. Use rags, sponges or paper towels to absorb the water remaining in the tank.

  2. 2

    Place a utility tub or small bucket beneath the inlet fitting before disconnecting it from the water supply so no water spills on the floor. Loosen the fitting either by hand or using channel-lock pliers. If the ring is rusted or difficult to turn, then spray with WD-40 to make it more maneuverable before twisting it off.

  3. 3

    Use the pliers to remove the two bolts that hold the tank to the bowl. Lift the tank away from the toilet and set it aside. Use the pliers to remove the plastic nut that holds the flush valve to the bottom of the tank. This is where the water leaves the tank when the toilet is flushed.

  4. 4

    Unscrew the float valve assembly to replace it with the assembly from the dual-flush conversion kit. Set the height of the new float valve to the same length as the previous float valve. Tighten all the plastic nuts. Replace the old toilet handle with the dual-flush handle. Use a small saw to cut the new handle to length if necessary.

  5. 5

    Connect the small line from the float valve to the flush valve. Return the tank to its place on the bowl and tighten the bolts that hold it in place. Replace the water line to the bottom of the tank.

  6. 6

    Turn on the water supply to the toilet tank while checking for leaks. Flush each handle to check for leaks again. If there is leakage, then find the source and either disconnect and readjust the parts involved or tighten the nuts or bolts near the area, depending on what is needed.

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