Bathtub Spout Replacement: Stopping a Leaky Diverter
When you pull the diverter on your tub spout and water still pours from the spout instead of going up to the showerhead, the spout's internal diverter has usually worn out. A spout can also drip steadily, come loose from the wall, or get so coated in mineral scale that the finish flakes. People sometimes blame the shower valve when the real culprit is the cheaper, more accessible part sticking out of the wall.
A tub spout connects to a short pipe stub coming out of the wall in one of two ways: it either threads onto a threaded pipe, or it slides over a copper stub and locks on with a small setscrew underneath. Spouts with a pull-up diverter contain a little mechanism that, when working, blocks the spout outlet and pushes water up to the shower. When that diverter wears, water leaks past it and the shower runs weak or not at all. Identifying which mount type you have, and matching the new spout to it, is the key step, because a slip-on spout and a threaded spout install completely differently.
How the job is done
- 1
Determine the mount type
We look underneath the spout for a setscrew, which means a slip-on style over a copper stub, versus a threaded spout that screws onto a pipe nipple; this drives everything that follows.
- 2
Remove the old spout
For a threaded spout we turn it counterclockwise, often with a cloth-wrapped wrench or a rag and bar inside it; for a slip-on we loosen the setscrew and pull it straight off.
- 3
Inspect and clean the pipe stub
We check the wall stub for length, threads, and corrosion, and clean off old tape or scale so the new spout seats correctly and seals against the wall.
- 4
Match the replacement spout
We select a spout that matches the mount type and the distance from the wall, since a spout that's too short or long won't sit flush or will leave the pipe exposed.
- 5
Install and seal the new spout
For threaded, we add fresh thread sealant and turn it until it's snug and pointing straight down; for slip-on, we slide it on and tighten the setscrew against the stub.
- 6
Test flow and the diverter
We run the tub, check that water flows cleanly with no drip at the wall, then pull the diverter to confirm it sends a strong stream up to the showerhead.
What a pro checks
- The two mount types, threaded and slip-on, look similar from the front, so we always check underneath for a setscrew before removing anything.
- A spout whose diverter won't send water to the shower is usually worn internally; replacing the spout is far simpler than opening the wall.
- We seal threaded spouts with proper thread sealant so the joint is watertight and the spout finishes pointing straight down.
- On slip-on spouts, the rubber O-ring on the copper stub matters; a dried or missing O-ring lets water weep out at the wall.
- Hard water leaves scale that can lock an old spout onto its stub, so patience and the right grip beat brute force that could crack tile.
- If the leak turns out to be behind the wall at the pipe stub rather than the spout, that's a larger repair that may need a licensed plumber.
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Frequently asked questions
Why does water still come out of my tub spout when I try to use the shower?
That almost always means the spout's internal diverter has worn out and can no longer block the spout outlet to push water upward. Since the diverter is built into the spout on most tubs, replacing the spout itself usually restores full flow to the showerhead.
How do I know if my spout screws on or slides on?
Look on the underside of the spout near the wall. If there's a small setscrew, it's a slip-on spout that clamps onto a copper stub. If there's no setscrew, it threads onto a pipe nipple. The type determines how it's removed and what replacement fits.
My tub spout drips even when everything is off. Is that the spout?
Sometimes, but a constant drip from the spout when the water is fully off often points to a worn shower valve cartridge upstream rather than the spout itself. We check both, since the fix is different depending on where the water is actually getting past.
Can I reuse my old tub spout if it still looks fine?
If the spout is sound and the only issue was, say, a loose mount, sometimes yes. But if the diverter is failing or the finish is scaling, reusing it just brings the problem back. We assess its condition and recommend replacement only when it makes sense.
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