How to Replace a Faucet Valve Stem

If you have a leaky faucet you may find all that is needed is a new faucet valve stem and washer. The valve stem is located under the handle of the faucet. Valve stems can become rusty over time, or the threads could have stripped when a prior owner installed or worked on the faucet. 

Step 1 - Turn Off the Water and Faucet

Turn off the water supply to the house. The main water valve is located by the water meter which is usually outside the house. Turn the valve clockwise until it stops. Turn the faucet on to release any excess water.

Step 2 - Cover the Drain and Open Handle

Once the water pipes are empty, cover the drain in the sink with a rag or other item to keep small parts from accidentally falling into the drain. Look at the handle on the faucet. Check if there is a cap in the center of the handle. If there is a cap remove it. The cap can be pried off using a flat head screw driver. If this is unsuccessful try a channel lock pliers. 

Step 3 - Take Notes and Remove Screw

It is a good idea to list on paper the order in which you remove parts. Depending on the type of faucet you may find there are more parts to be removed than expected. Under the cap you will see a screw. Using the appropriate style screw driver, turn the screw counterclockwise and remove. 

Step 4 - Remove Handle and Disassemble

Remove the decorative handle. Now you will see the stem. Remove the collar from around the stem. Depending on the type of faucet you are working on and how old it is, there may be several other parts to remove before the stem and collar can be removed. In a newer simple system, there is usually only the collar, but older faucets, especially bath tub faucets, may have a knurled fitting that can be removed with a channel lock. Once removed, there may be some hexagonal parts that can be removed with a wrench.

Step 5 - Remove Stem and Go to the Store

Using a valve stem wrench or channel locks, remove the stem.  Bring the stem to the local hardware or plumbing supply store. You will not know what kind of stem you need prior to taking the faucet apart. Do not buy the stem in advance. Wait until you have the old one in hand.

Find the same stem at the hardware store. Ask for assistance to make sure you are purchasing the right part. A new washer is usually included with the stem but double check just to be sure. The washer is located in the recessed end of the stem.

Step 6 - Check the Washer and Replace Fittings

Before installing the new stem make sure the washer is installed in the bottom of the stem securely. It should be snug in the recess. Install the stem in the faucet. If applicable, replace the fittings and hexagonal parts. Refer to your notes to install in proper order and tighten securely.

Step 7 - Replace Parts and Test

Replace the collar, decorative handle and screw. Make sure the screw is tight.  Turn the main shut off back on. Test the faucet. If there is no leak you have solved the problem.