A bath spout replacement takes about 30 minutes and costs $15 to $50 for the part
A bath spout is the pipe that sticks out of your wall and delivers water to the tub. When it leaks, drips, or the diverter (the knob that switches water from spout to showerhead) stops working, you replace just the spout—not the whole valve behind the wall. The job requires only a wrench or Allen key, no soldering, and you do not need to turn off the water to the whole house.
The spout screws or bolts onto a threaded pipe called a nipple that sticks out from the wall. You unscrew the old spout, screw on the new one, and tighten it. The hardest part is usually getting the old one loose if it has been there for years.
Key Takeaways
- Bath spouts are held on by a set screw (usually under the handle) or by a bolt that threads onto the wall pipe, and you remove whichever one your spout uses.
- Measure the diameter of the pipe sticking out of the wall before you buy a replacement, because spouts come in different sizes and they must match.
- If the spout will not budge after you loosen the fastener, explore penetrating oil and wait 15 minutes, then try again with a longer wrench for more leverage.
- New spouts cost between $15 and $50 depending on material and finish, and you can find the right one by taking a photo of your old spout to a plumbing supply store.
- If you crack the wall tile or the spout still leaks after replacement, call a plumber—a leaking spout usually means the valve behind the wall needs repair.
Identify how your spout is fastened
Bath spouts fasten in one of two ways. The first is a set screw: a small bolt hidden under the spout handle or on the underside of the spout itself. The second is a threaded connection: the spout screws directly onto the pipe coming out of the wall, and you tighten or loosen it with a wrench.
To find out which you have, look under the spout handle. If you see a small hole or slot, that is a set screw. Use an Allen key (hex wrench) or a flathead screwdriver to loosen it. If there is no screw visible, the spout is threaded on. In that case, you will grip the spout body with a wrench and turn it counterclockwise to unscrew it.
If your spout has a diverter (a pull-up knob or lever that sends water to the showerhead), the fastening method is the same—the diverter is part of the spout assembly and comes off with it.
Measure the pipe and buy the right replacement
Before you remove the old spout, measure the diameter of the pipe sticking out of the wall. Use a ruler or calipers to measure across the pipe. Most bath spouts fit a half-inch pipe, but some fit three-quarter-inch. If you buy the wrong size, the new spout will not thread on or will be loose.
Write down the pipe size, the finish of your old spout (chrome, brushed nickel, oil-rubbed bronze), and whether it has a diverter. Take a photo of the old spout and bring it to a plumbing supply store or a big-box hardware store. A staff member can match it or show you compatible options. Spouts range from $15 for basic chrome to $50 or more for designer finishes.
If you cannot get to a store, you can order online, but measure the pipe diameter twice to be sure. Many retailers accept returns if the size is wrong, but shipping costs money and time.
Remove the old spout
If your spout has a set screw, use the correct Allen key or screwdriver to loosen it. Turn counterclockwise until the screw is loose enough that the spout slides off the pipe. Do not remove the screw completely—just loosen it enough to release the spout. Once it is loose, grip the spout body and pull it straight out toward you.
If your spout is threaded on, use an adjustable wrench or a pipe wrench to grip the spout body. Position the wrench as close to the wall as you can, then turn counterclockwise. The spout will unscrew. If it is stuck, spray penetrating oil (like WD-40) around the base where the spout meets the wall, wait 15 minutes, and try again. A longer wrench gives you more leverage. Once it is loose, unscrew it by hand the rest of the way.
When the old spout comes off, you may see a small amount of water drip from the pipe. This is normal—it is just water in the pipe. Wipe it dry with a cloth.
Clean the threads and install the new spout
Before you screw on the new spout, wipe the threads on the wall pipe with a clean cloth to remove any old tape, mineral deposits, or debris. If the threads are corroded or damaged, you may need a plumber to replace the nipple, but usually a quick wipe is enough.
If the new spout comes with plumber's tape (also called PTFE tape or Teflon tape), wrap it around the threads three times clockwise. This tape seals the connection and prevents leaks. If tape is not included, you can buy a roll for a few dollars at any hardware store.
Screw the new spout onto the pipe by hand first, turning clockwise until it is snug. Then use the wrench to tighten it another quarter turn. Do not over-tighten—you only need it tight enough that it does not leak. If the spout has a set screw, tighten that screw now with the Allen key or screwdriver.
Test for leaks and check the diverter
Turn on the water at the tub faucet and let it run for 30 seconds. Watch where the new spout meets the wall. If water drips from that joint, turn off the water, use the wrench to tighten the spout another quarter turn, and test again. If it still leaks after a second tightening, the threads may be damaged and you will need a plumber.
If your new spout has a diverter, pull up the knob or lever to send water to the showerhead. The water should stop flowing from the spout and come out of the showerhead instead. If water still comes from the spout when the diverter is pulled, the diverter inside the spout is faulty. This is rare with a new spout, but if it happens, contact the manufacturer or return the spout.
Let the water run for a minute to make sure everything is working, then turn it off. Check the joint one more time to confirm there are no new leaks.
When to call a plumber instead
If the old spout will not come loose even after penetrating oil and a long wrench, the pipe itself may be corroded or the connection may be damaged. Forcing it can crack the pipe inside the wall, which is expensive to repair. A plumber can remove it safely or replace the nipple if needed.
If the new spout leaks from the joint after you have tightened it twice, the threads on the wall pipe are likely stripped or corroded. A plumber can install a new nipple or use a repair fitting to fix the connection.
If water leaks from inside the spout body itself (not from the joint where it meets the wall), the valve behind the wall is failing. This is not a spout replacement job—the plumber will need to access the valve from inside the wall or from the other side of the bathroom.
Frequently Asked Questions
Can I replace a bath spout without turning off the water?
Yes. The spout is downstream of the main valve, so turning off the water to the whole house is not necessary. You may see a small amount of water drip when you remove the old spout, but it will stop quickly. If you want to avoid even that, you can turn off the water to just the bathroom if your home has individual shut-off valves under the sink or toilet.
What if the new spout does not fit the pipe?
If you bought the wrong size, most hardware stores and plumbing suppliers will exchange it for the correct one if you have your receipt and the spout is unused. Measure the pipe diameter again before you go back. If the pipe itself is damaged or an unusual size, a plumber can install a threaded adapter to make a standard spout fit.
Do I need plumber's tape on the threads?
Plumber's tape is not always required, but it is cheap and makes the seal more reliable. If your new spout comes with tape already applied or instructions that say not to use it, follow those instructions. Otherwise, wrapping the threads three times is a good practice and takes 30 seconds.
Why does my new spout leak from the joint even after I tightened it?
The wall pipe threads may be stripped, corroded, or damaged. Tightening more will not help and can crack the spout. Stop tightening and call a plumber. They can replace the nipple (the pipe sticking out of the wall) or use a repair fitting to seal the connection.
Can I replace a spout with a diverter with one without a diverter?
Yes, as long as the new spout fits the same pipe size. However, if you do, the showerhead will no longer work unless you install a separate valve to control it. Most people replace a spout with a diverter with another spout that has a diverter to keep the showerhead functional.