How to Replace a Bathtub Faucet

Often times a leaky bathtub faucet can be fixed, but if the diverter will no longer force water up to the shower without leaking, it is time for a new faucet. Luckily, replacement options are vast at local home improvement stores and via the Internet. The replacement is a simple procedure and takes less than an hour. Specialty tools are often not needed, but can sometimes make the job easier.

Step 1 - Remove the Old Faucet

Check underneath the faucet for a set screw holding the faucet in place. If there is, use a small screwdriver or allen wrench to undo the screw. The faucet should come off easily once the screw is removed. If no set screw is present, place the wooden handle of a hammer inside the opening of the faucet and firmly turn counter-clockwise. Use the hammer to turn until the faucet can be removed by hand. Once the faucet is removed, the spout nipple will be revealed.

Step 2 - Purchasing a New Faucet

With the old faucet in hand, go to the pluming of home improvement store to purchase another one of identical size and style. The stem which supports the faucet is specifically sized and so identical sizing can be important. If an identically sized faucet cannot be found, a new spout nipple can be purchased to fit the new faucet. The style of the faucet cannot be altered, however. A slip on faucet (with a set screw) must be replaced by a slip on faucet. A screw on faucet, must be replaced by a screw on faucet.

Step 3 - Attaching the Nipple Spout

If a spout nipple needed to be purchased, or if the new faucet came with a new nipple spout, the old spout will need to be removed. At the base of the spout is a bonnet nut. The bonnet nut will normally be visible, but at times can be recessed. Use the pipe or basin wrench to remove the bonnet nut and the stem will come out with the bonnet nut. If significantly recessed an internal pipe wrench can be purchased. Attach the new nipple spout using plumbing tape around the nipple threads and thread the bonnet nut on the end. Screw the bonnet nut back into place with the new nipple attached.

Step 4 - Attaching the Faucet

Apply plumbers or Teflon tape around the threads on the nipple spout and thread the faucet onto the nipple. Attach the faucet one turn past fingertip tight. Do not over-tighten the faucet as it can bend the spout nipple. Be especially careful if the spout nipple is copper. If desired, caulk or silicone joint compound can be spread around the joint where the faucet meets the wall to seal the new faucet into place. This is often not necessary, but can be applied as a precautionary measure.