The bathroom faucet is an integral part of any bathroom design. Today's faucet mixes the water directly in the spout, rather than the old mixer taps which could cause scalds. Older faucets, such as those with plastic cartridges, however, can begin to wear out and leak over time. Changing them can save gallons of wasted water over the course of a year. Replacing bathroom mixer taps is something nearly any homeowner can do.
Shut off the water to the bathroom, and turn on the current faucet's hot and cold valves to clear water from the pipes.
Disconnect the tubing from the base of each tap beneath the counter to remove the water source. Use the wrench if necessary, and unscrew the water supplies located at each handle.
Disconnect the drain pipe from the tail piece of the sink drain. Replace the drain along with the faucet to ensure a finish match.
Disconnect the spout from the handles if applicable. Single hole faucets and separate taps will not require this step. Disconnect the spout from the drain, and lift the drain out.
Using the hexagonal key, locate the screw on the escutcheon plate of each handle and remove the trim from the cartridge. If the handles have porcelain caps, remove the cap and use the screwdriver to loosen the handles from this point.
Unscrew the base of each tap and the spout from below the counter by using the wrench around the plastic rings and removing the old faucet completely.
Place the new cartridges and spout in the holes left, tightening them down from beneath the counter with the wrench.
Place the escutcheons and trim of the handles onto each tap, and screw them in place with the hex key. Be careful to line up the taps so they turn on properly. If the faucet has porcelain caps on each handle, use the screwdriver to tighten the faucet, and place the porcelain caps over the screws.
Connect the spout to the handles and to the drain beneath the counter, and connect the water supplies to each handle.
Reconnect the drain, and turn the water to the bathroom back on to test the faucet and check for leaks.
Use the foam ring provided to create a tight seal at the drain ring that will not harm the porcelain of the sink. Make sure that the handles turn in the proper directions before the final tightening of the screws. If the drain is a pop-up, test the pop-up handle on top of the spout before connecting the handles to the spout to ensure it moves freely and to ensure room to make adjustments.