Remove the old spout first

A Delta tub spout unscrews by hand or with a wrench, depending on the model. Look underneath the spout where it meets the wall — you will see either a small setscrew or a collar that twists. If there is a setscrew (a tiny screw on the underside), use a 1/16-inch or 3/32-inch Allen wrench to loosen it, then pull the spout straight out toward you. Do not turn it; pull it.

If there is no setscrew, the spout has a collar. Grip the spout body with one hand and use an adjustable wrench or pipe wrench on the collar (the hexagonal or round part closest to the wall) to turn it counterclockwise. Turn slowly — you are unscrewing the collar from the nipple (the pipe stub sticking out of the wall), not the spout itself. Once the collar is loose, unscrew it by hand and slide the spout off.

Clean the nipple threads with a dry cloth. If the old spout left mineral buildup or corrosion, use a wire brush or old toothbrush to scrub it away. This step matters: debris on the threads will prevent the new spout from seating properly and may cause a leak.

Key Takeaways

  • Delta spouts come off either by loosening a setscrew with an Allen wrench and pulling straight out, or by unscrewing a collar with a wrench.
  • Measure the nipple diameter (the pipe sticking out of the wall) before buying a replacement — Delta makes spouts for 1/2-inch and 3/4-inch nipples, and they are not interchangeable.
  • Wrap the nipple threads with plumber's tape (also called Teflon tape) before screwing on the new spout to prevent leaks.
  • The new spout should sit flush against the wall with no gap; if it does not, the threads may be damaged and you may need a nipple extension.

Measure the nipple and buy the correct replacement

The nipple is the short pipe sticking out of the wall where the old spout was. Measure its diameter with a ruler or calipers. Most residential Delta spouts fit a 1/2-inch nipple, but some fit 3/4-inch. The package will say which one — check before you buy. Buying the wrong size means a trip back to the store.

Bring the old spout with you if you still have it, or take a photo of the nipple. A hardware store employee can match it by sight. If you are ordering online, confirm the nipple size in the product description; it is usually listed as "1/2-inch IPS" or "3/4-inch IPS" (IPS means iron pipe size).

Wrap the threads with plumber's tape

Plumber's tape (also called Teflon tape or PTFE tape) is a thin white tape that seals threaded connections and prevents leaks. Wrap it around the nipple threads clockwise, starting near the wall and working outward. Use three to four layers, wrapping tightly so the tape does not bunch or slip. The tape should cover all the threads that will be inside the spout collar.

This step is not optional. Without tape, water can seep between the threads and drip behind the wall. The tape costs less than a dollar and takes 30 seconds.

Screw on the new spout

If your new spout has a collar, screw it onto the nipple by hand first, turning clockwise. Once it is hand-tight (snug but not forced), use a wrench to tighten it another quarter turn. Do not over-tighten — you are sealing threads, not crushing metal. A quarter turn past hand-tight is enough.

If your new spout has a setscrew instead of a collar, slide it onto the nipple and push it all the way to the wall. The spout should sit flush with no gap. Then use an Allen wrench to tighten the setscrew on the underside. Tighten it firmly but do not strip it — stop when you feel solid resistance.

Test for leaks

Turn on the tub faucet and let water run for 30 seconds. Watch the connection where the spout meets the wall. If water drips from the collar or setscrew area, turn off the water and tighten the collar another quarter turn with a wrench, or tighten the setscrew another half turn with the Allen wrench. Wait 10 seconds and check again.

If water still drips after a second tightening, turn off the water, remove the spout, and rewrap the threads with fresh tape. Mineral deposits or old tape can prevent a seal. Once you have rewrapped, screw it back on and test again.

Common mistakes that cause leaks or damage

The most common error is over-tightening the collar. If you use a wrench and turn more than a quarter turn past hand-tight, you risk cracking the spout body or stripping the nipple threads. Tighten gently and test; you can always tighten more, but you cannot undo a crack.

Another mistake is forgetting the plumber's tape. Water will find its way between the threads and leak behind the wall, where you cannot see it until damage has started. Even if the spout feels tight, tape it.

A third error is buying the wrong nipple size. A 1/2-inch spout will not thread onto a 3/4-inch nipple, and forcing it will strip the threads. Measure before you buy.

What to do if the spout will not tighten

If the collar spins freely and will not tighten, the nipple threads are likely stripped. You have two options: use a nipple extension (a short threaded adapter that screws onto the damaged nipple and gives you fresh threads), or replace the nipple itself. A nipple extension is faster and costs a few dollars. Screw it onto the nipple, wrap it with tape, and screw the spout onto the extension.

If you choose to replace the nipple, you will need to cut the old one out with a reciprocating saw or hacksaw, then screw a new one in by hand using two pipe wrenches (one to hold the fitting inside the wall, one to turn the nipple). This is more involved and usually worth calling a plumber for, unless you are comfortable working with pipe fittings.

Frequently Asked Questions

How do I know if my Delta spout has a setscrew or a collar?

Look at the underside of the spout where it meets the wall. If you see a small screw, it is a setscrew model. If you see a hexagonal or round metal piece, it is a collar. The package of your new spout will tell you which type it is before you buy.

Can I use the old spout again if I remove it carefully?

You can, but Delta spouts are inexpensive (usually $10 to $30) and removing them often damages the internal seal or collar. If the spout is still working and you are just replacing it for looks, you might reuse it elsewhere, but for the original location, a new spout is safer and more reliable.

What if water leaks from inside the wall after I install the new spout?

This usually means the tape did not seal properly or the collar is not tight enough. Turn off the water, remove the spout, and inspect the nipple threads for damage or debris. Clean them, rewrap with fresh tape, and reinstall. If leaking continues, the nipple itself may be cracked, and you will need a replacement nipple or extension.

Do I need a special wrench for the collar?

No. An adjustable wrench, pipe wrench, or crescent wrench will work. Use whichever you have. The collar is usually 1 to 1.5 inches across, so a standard adjustable wrench sized for that range is ideal.

How tight should the setscrew be?

Tight enough that the spout does not move when you pull on it, but not so tight that you strip the screw or crack the spout body. Use a 1/16-inch or 3/32-inch Allen wrench and turn until you feel firm resistance, then stop. If you hear a cracking sound or the wrench suddenly becomes very hard to turn, you have gone too far.