How to Replace a Tub Spout With Diverter

Step 1: Make sure the tub spout with diverter is the right repair

1. Look for the usual signs of a failed tub spout with diverter: water keeps running from the tub spout when the shower is on, the diverter knob will not stay up, or shower flow is weak even though the valve is fully on.
2. Check that the problem is centered at the spout, not the valve handle. If the handle is hard to turn, the water will not shut off, or flow is poor at both the tub and shower, the issue may be elsewhere.
3. Run the water and pull the diverter. A worn spout often leaks heavily from the spout outlet while the shower is running.
4. Look under the spout near the wall for a small set screw. If you do not see one, the spout is often threaded on.

If it works: You have a clear reason to replace the spout and a basic idea of how the old one attaches.

If it doesn’t: If the tub and shower both have low flow, or the faucet valve is the real problem, diagnose the valve, cartridge, or supply issue before replacing the spout.

Step 2: Set up the area and remove the old spout

1. Close the tub drain or lay a rag in the tub so small screws do not disappear.
2. Protect the tub and spout finish area with a towel or rag.
3. If the spout has a set screw underneath near the back, loosen it with the correct hex key and pull the spout straight off.
4. If there is no set screw, wrap the spout with a rag or use a strap wrench and turn it counterclockwise to unthread it.
5. Once the spout is off, wipe the pipe clean so you can inspect the connection.

Step 3: Match the replacement to the connection and pipe length

1. Compare the old spout and new tub spout with diverter side by side.
2. Confirm the new spout uses the same connection style as the old one: slip-on with set screw or threaded.
3. Check the manufacturer's included fit guidance for pipe size and stub-out length range before installing.
4. If the new spout uses a set screw, make sure the pipe is smooth and in good shape where the spout will slide on.
5. If the new spout threads on, inspect the pipe threads and clean off old tape or debris.

Step 4: Install the new tub spout with diverter

1. For a threaded spout, wrap plumber's tape neatly on the pipe threads, then thread the new spout on by hand until snug and aligned downward.
2. If needed, use a wrench over a rag or a strap wrench to make the final small adjustment. Do not over-tighten.
3. For a slip-on spout, slide the spout fully onto the pipe until it sits close to the wall, then tighten the set screw firmly.
4. Keep the spout level and make sure the diverter knob moves freely.
5. Wipe away any debris and make sure the spout sits flat and solid.

Step 5: Test tub flow, diverter action, and leaks

1. Turn the water on with the diverter down and let the tub spout run for a minute.
2. Check around the wall opening and under the spout for drips.
3. Pull the diverter to send water to the shower and watch the tub spout outlet. A small dribble can be normal, but it should not keep pouring out.
4. Cycle the diverter a few times to make sure it moves smoothly and returns properly.
5. After the test, dry the area and check again for fresh moisture.

If it doesn’t: If water still pours from the tub spout during shower use, recheck that you installed the correct replacement and that it is fully seated on the right connection type.

Step 6: Confirm the repair holds in normal use

1. Use the tub and shower the way you normally would over the next day or two.
2. Watch for slow drips from the spout, moisture at the wall, or a diverter that slips back down during a shower.
3. Make sure the shower flow stays stronger than before and the tub spout no longer steals most of the water when diverted.
4. Keep the hex key or wrench handy until you are sure the spout stays tight.

If it works: The new tub spout with diverter stays secure, switches cleanly, and holds up in real use without leaks.

If it doesn’t: If the same symptoms return quickly, the root cause may be the wrong spout type, a damaged pipe stub-out, or a valve issue upstream.