How to Replace an Angle Shutoff Valve

Step 1: Confirm the angle shutoff valve is the problem

1. Look closely at the valve while the fixture is off and again while it is running.
2. Check where the water is coming from: the valve body, the handle stem, the compression nut at the wall side, or the supply line connection at the top.
3. Turn the valve clockwise to see whether it actually shuts the fixture off. If the handle spins freely, will not close, or the valve leaks from the body or stem, replacement is usually the right fix.
4. Make sure the leak is not just from the supply tube or from water dripping down from above onto the valve.

If it works: You have confirmed the angle shutoff valve itself is leaking, seized, or no longer shuts off reliably.

If it doesn’t: If the leak is only at the supply line connection, try replacing or tightening the supply line first. If water is coming from inside the wall, this is not a simple valve swap.

Step 2: Shut off the water and drain the line

1. Turn off the home's main water supply.
2. Open the nearby faucet served by this valve to relieve pressure and drain as much water as possible.
3. Place a bucket or shallow pan under the valve and lay down towels around the work area.
4. Disconnect the fixture supply line from the top of the shutoff valve if it is in the way.

Step 3: Remove the old valve without twisting the pipe

1. Identify the connection type before loosening anything. Many angle shutoff valves are compression or threaded, while some are soldered or push-fit.
2. Use one wrench or pliers to hold a backup grip on the pipe side or valve body, and a second wrench to loosen the nut or valve so the pipe does not twist in the wall.
3. For a compression valve, loosen the compression nut and slide the valve off if it will come free cleanly.
4. If the old compression sleeve is stuck and the exposed pipe is long enough, cut the pipe cleanly behind the old sleeve instead of prying hard on the stub-out.
5. Wipe the exposed pipe end clean so you can inspect it.

Step 4: Install the matching replacement valve

1. Compare the new angle shutoff valve to the old one and confirm the inlet connection type, outlet size, and angle match.
2. If the new valve uses a threaded connection, wrap PTFE tape on the male threads only.
3. For a compression-style valve, slide the nut and ferrule onto the pipe if they are not already part of the valve, then push the valve fully onto the pipe.
4. Tighten the connection snugly while holding a backup wrench so the pipe does not twist. Do not overtighten and crush the fitting.
5. Reconnect the fixture supply line to the top of the new valve.

Step 5: Restore water slowly and check for leaks

1. Leave the new angle shutoff valve in the off position.
2. Turn the home's main water back on slowly.
3. Dry the valve, nuts, and supply line connections completely with a rag.
4. Watch the valve for several minutes and feel around each connection for moisture.
5. If a compression or threaded connection seeps slightly, tighten it a little at a time while holding a backup wrench.

If it doesn’t: If a connection still seeps after a small adjustment, shut the water back off, disconnect it, and inspect the fitting surfaces and alignment before trying again.

Step 6: Test the valve in real use

1. Open the new angle shutoff valve slowly and run the fixture normally for a few minutes.
2. Turn the valve off again and confirm the fixture flow stops fully or nearly fully as expected for that fixture.
3. Open and close the valve a few times to make sure the handle moves smoothly and the packing area stays dry.
4. Check again after 15 to 30 minutes and once more later in the day for any slow seepage.

If it works: The fixture runs normally, the valve shuts off properly, and the repair stays dry after repeated use.

If it doesn’t: If the valve does not shut off fully or develops a slow leak later, replace it again with the correct matching valve or have the stub-out inspected for damage.