Replacing a Delta tub spout is a straightforward job that takes about 15 minutes and requires only a screwdriver or Allen wrench

Delta tub spouts come off in one of two ways: either the spout unscrews by hand (or with a pipe wrench), or it slides off a mounting bracket after you remove a single set screw hidden underneath. Once you know which type you have, the whole job is removing the old one and sliding or screwing the new one on. You do not need to turn off the water or drain the tub.

The hardest part is usually finding the set screw if your spout uses one. It sits on the underside of the spout where it meets the wall, and Delta hides it deliberately so it does not show. A flashlight and a few seconds of looking will find it.

Key Takeaways

  • Delta spouts either unscrew by hand or slide off after you remove a hidden set screw underneath—check which type yours is before you start.
  • If your spout unscrews, use a pipe wrench or adjustable wrench to grip the spout body (not the trim ring) and turn counterclockwise.
  • If your spout has a set screw, use a 3/32-inch Allen wrench or small screwdriver to remove it from underneath, then slide the spout straight out toward you.
  • When installing the new spout, hand-tighten first, then use a wrench for a final quarter-turn if it unscrews, or push it firmly onto the bracket until it stops if it slides.
  • Do not overtighten—a spout that leaks usually needs the internal cartridge replaced, not a tighter connection.

Identify which type of Delta spout you have

Look at the underside of your spout where it meets the wall. If you see a small hole or slot, your spout uses a set screw and slides off. If you see no hole and the spout appears to be one solid piece screwed into the wall, it unscrews.

The set screw is usually 3/32 inch and sits in a small recessed hole on the bottom of the spout. You may need a flashlight to see it clearly. If you are still unsure, try turning the spout gently by hand—if it moves at all, it unscrews. If it does not budge, it almost certainly has a set screw.

Remove a spout that unscrews

Wrap an old towel or cloth around the spout body to protect the finish. Grip the spout itself (not the trim ring or escutcheon plate around it) with a pipe wrench or adjustable wrench, and turn counterclockwise. Start gently—you are looking for the point where it breaks free, then you can turn it by hand the rest of the way.

Once the spout is loose enough to grip by hand, finish unscrewing it. You may see a small amount of water drip out—this is normal and comes from the spout itself, not the supply line. Wipe the threads clean with a cloth before installing the new spout.

Remove a spout with a set screw

Use a 3/32-inch Allen wrench or a small flathead screwdriver to remove the set screw. The screw is small and straightforward to lose, so place it somewhere you will not drop it. Once the screw is out, the spout should slide straight toward you off the mounting bracket. If it resists, wiggle it gently side to side as you pull.

Look inside the hole where the spout was. You will see a brass or plastic mounting bracket screwed to the copper pipe stub coming out of the wall. This bracket stays in place—you are only replacing the spout itself. Wipe away any old caulk or debris from around the bracket.

Install the new Delta spout

If your old spout unscrewed, hand-thread the new spout onto the pipe stub. Turn it clockwise until it is hand-tight, then use your wrench to turn it another quarter-turn. Do not over-tighten—this is a common mistake and does not fix leaks. A spout that leaks at the base usually has a worn internal cartridge, which requires a different repair.

If your old spout had a set screw, slide the new spout onto the mounting bracket and push it firmly until it stops. The spout should sit flush against the wall. Insert the set screw and tighten it with your Allen wrench until snug—again, do not force it.

Seal around the spout if needed

If there is a gap between the spout and the wall tile or surround, you can fill it with silicone caulk. This is optional but prevents water from running behind the spout and into the wall. Use a caulk gun to explore a thin bead, then smooth it with a wet finger or caulk tool.

Let the caulk cure for 24 hours before using the tub. If you do not caulk, the spout will still work fine—the gap just means water may eventually seep behind it.

Troubleshooting a spout that still leaks

If water drips from the spout after you install it, the problem is not the connection—it is the internal diverter cartridge inside the spout. This is a separate part that wears out over time and causes water to leak from the spout even when the shower valve is turned on. Replacing the spout itself will not fix this.

To replace the cartridge, you will need to remove the spout again and order a Delta cartridge kit for your specific spout model. The model number is usually stamped on the back of the spout. If the cartridge is the issue, a plumber can handle it in under an hour, or you can order the kit and do it yourself following the instructions that come with it.

Frequently Asked Questions

Do I need to turn off the water to replace the spout?

No. The tub spout is not connected to the supply line—it is just a fitting that slides or screws onto a pipe stub. Water will not spray out when you remove it. You may see a small drip from inside the spout itself, which is normal.

What size Allen wrench do I need for the set screw?

Most Delta spouts use a 3/32-inch Allen wrench for the set screw. If that does not fit, try a 1/8-inch. Both are small and inexpensive. A small flathead screwdriver will also work if you do not have an Allen wrench.

Can I use plumber's tape on the threads?

You can, but it is not necessary for a spout that unscrews. Plumber's tape (also called PTFE tape) is meant for connections that carry water under pressure. A tub spout is just a trim piece, and the threads are usually tapered so they seal by themselves. Hand-tight plus a quarter-turn is the right amount.

What if the old spout is stuck and will not unscrew?

Spray the base with penetrating oil (like WD-40) and let it sit for 30 minutes. Then try again with your wrench. If it still will not move, wrap a rubber band around the spout to improve your grip, or use a longer wrench for more leverage. Do not force it hard enough to crack the spout—if it will not budge, a plumber can remove it without damaging the wall.

How do I know which Delta spout model to order?

The model number is stamped on the back of the old spout. Write it down and search for "Delta [model number] tub spout" online, or take the old spout to a plumbing supply store and they will match it. If you cannot find the number, take a photo of the spout and bring it with you—most stores can identify it by sight.