Installing A Dual Flush Toilet

A dual flush toilet system is an excellent way to cut back on the amount of water used for flushing waste down the toilet. This type of toilet provides two different options for toilet flushing, each using a different amount of water. Liquid wastes use a smaller amount of water – usually .8 gallons – and a larger amount of water for solid wastes – usually 1.6 gallons.

Dual flush toilets have become very popular in Europe and Australia and are only beginning to become popular in the United States. In most cases, they are installed in homes in regions where concerns about water usage are high and municipal governments have placed restrictions on residential water usage.

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Step 1 - Measure

Measure the distance from the wall behind the toilet to the center of the bolts currently affixing a toilet to the floor. Also check the diameter and shape of the base as you will need this information when you select a new toilet.

Step 2 - Turn Off Water Supply

Turn the water supply to the toilet off. Usually you can accomplish this by simply turning off the water valves behind the existing toilet. Flush the toilet several times to remove water from the toilet. Suction any remaining water out with a shop vac.

Step 3 - Get Prepared

Place a runner of plastic from the old toilet to the hall and to the outdoors for when you remove the toilet. As an alternative to carrying the toilet outside, use a wheelbarrow.

Step 4 - Disconnect the Toilet

Disconnect the toilet's supply hose.

Step 5 - Remove the Toilet

Disconnect the tank from the bowl. Usually there are two bolts, one on either side of the toilet to remove. Unscrew the two bolts that attach the old toilet to the floor. Remove the old toilet.

Step 6 - Insert Rag in Floor Drain

To stop and trap any gas that might escape from the drainpipe, put a rag in the floor drain
Clean away any old wax with a utility knife or putty knife.

Following the manufacturer instructions, install the wax seal or gasket of the new toilet. In most cases, hardware and fittings are included when you purchase a dual flush toilet.

Step 7 - Install Adapter

Install the offset collar/adapter of the new toilet to the closet flange. This is the fitting connecting to the drain line.

Step 8 - Install Toilet

Set the toilet in place. Attach any needed bolts. Install the rubber gasket on the outlet of the new water tank and insert the screws and rubber washers. Attach the tank to the bowl by sliding the screws through the holes in the back of the bowl. Add and tighten the nuts.

Step 9 - Connect Water Supply

Connect the water supply hose. If desired use the new water supply hose included in the toilet installation kit.

Step 10 - Level the Toilet

Use a level to determine if the toilet is sitting level on the floor. If not, place a shim under the bottom rim of the toilet until it is level. It may be necessary to use two shims for balance.

Apply silicon seal around the base of the toilet. Reconnect the water line. Install the toilet seat.