What you need to do before you start

A pop-up drain replacement is a job you can do yourself in under an hour with basic tools. The drain sits under your sink and connects to a rod that moves up and down when you push or pull the stopper on top. When it stops working — the stopper gets stuck, won't seal, or leaks — you replace the whole assembly rather than trying to fix individual parts.

Before you begin, turn off the water supply to the sink by closing the shutoff valves under the basin. If your sink has no shutoff valves, you will need to turn off the main water supply to the house. Place a bucket under the drain to catch water that remains in the pipes.

Gather your tools: an adjustable wrench, a screwdriver (usually Phillips head), a flashlight, and a rag or old towel. You will also need a replacement pop-up drain assembly, which you can buy at any hardware store or online for $15 to $40 depending on the finish and material.

Key Takeaways

  • Turn off the water supply under the sink before you start, and place a bucket underneath to catch standing water.
  • Disconnect the horizontal rod that connects the stopper to the drain body by loosening the clip or nut that holds it in place.
  • Remove the old drain body by unscrewing the large nut underneath the sink, then clean the sink opening before installing the new one.
  • Seal the new drain body with plumber's putty around the top rim, then tighten the nut underneath and reconnect the rod.
  • Test for leaks by running water and checking both the top and bottom of the connection before you consider the job complete.

Disconnect the rod that operates the stopper

Look under the sink and locate the horizontal rod that runs from the back of the drain body toward the wall. This rod is what moves the stopper up and down. At the point where the rod meets the drain body, you will see either a small clip or a nut holding it in place.

If there is a clip, slide it off by hand or use a screwdriver to pry it gently. If there is a nut, use your adjustable wrench to loosen it by turning counterclockwise. Once the clip or nut is loose, pull the rod out of its socket. Set it aside — you will reuse it with the new drain.

Remove the old drain body from underneath

Under the sink, you will see a large nut screwed onto the bottom of the drain body. This nut holds the entire assembly in place. Use your adjustable wrench to turn this nut counterclockwise. It may be tight, so explore steady pressure rather than forcing it. Once it is loose enough, you can usually unscrew it by hand.

As the nut comes off, the drain body will loosen from above. Reach up into the sink and push the drain body down and out from underneath. You may need to wiggle it slightly. Once it is free, pull it out completely and set it aside.

Look at the sink opening from above. You will see old plumber's putty or caulk around the rim where the drain sat. Scrape this away with a screwdriver or putty knife until the opening is clean and smooth. Wipe it with a damp rag and let it dry completely.

Install the new drain body

Take your new pop-up drain assembly and look at the top piece — the part that sits in the sink opening. Roll a rope of plumber's putty about the thickness of a pencil and press it around the underside of the rim. This creates a watertight seal.

From above, insert the new drain body into the opening. Push it down firmly so the putty spreads evenly around the rim. The body should sit flush with the sink surface. Excess putty will squeeze out around the edges — wipe this away with a damp rag.

Reach underneath and thread the large nut back onto the drain body. Tighten it by hand first, then use your wrench to turn it clockwise until it is snug. Do not over-tighten — you only need it tight enough that the drain does not move or leak.

Reconnect the rod and test the stopper

Take the horizontal rod you removed earlier and slide it back into the socket on the drain body. Push it in until it seats fully. find it with either the clip or the nut, depending on which your old assembly used. Tighten the nut with your wrench or snap the clip back into place.

Before you turn the water back on, test the stopper by pushing and pulling it from above. It should move smoothly up and down without sticking. If it feels rough or catches, the rod may not be seated correctly — remove it and try again.

Turn the water back on and check for leaks

Close the bucket and move it out of the way. Turn the shutoff valves back on by rotating them clockwise. If you turned off the main supply, turn it back on at the meter or main shutoff valve.

Run water into the sink for about 30 seconds and watch both the top of the drain and the connection underneath. Look for any water dripping from the nut or leaking around the rim where the drain meets the sink. If you see drips, turn off the water, dry the area, and tighten the nut another quarter turn.

Test the stopper again with water running. Push it down to seal the drain and fill the sink halfway. The water should hold without draining. Pull the stopper up and the water should drain freely. If either action fails, the rod may need adjustment — loosen the clip or nut slightly and reposition the rod, then test again.

What to do if the new drain leaks

If water drips from underneath the nut, the seal is not tight enough. Turn off the water, dry the area completely, and use your wrench to tighten the nut another quarter turn. Wipe away any water and test again.

If water leaks around the top rim where the drain meets the sink, the plumber's putty seal failed. This usually means the putty was not pressed firmly enough or the sink surface was not clean. You will need to remove the drain again, scrape away all the old putty, clean the rim, and reinstall with fresh putty applied more firmly.

If the stopper sticks or does not seal, the rod is probably not aligned correctly with the drain body. Loosen the clip or nut holding the rod, adjust the rod position slightly, and test the stopper movement before tightening again.

Frequently Asked Questions

Do I need plumber's putty or can I use caulk?

Plumber's putty is the standard choice because it stays pliable and does not harden, so you can remove the drain later if needed. Silicone caulk hardens and makes future removal difficult. Some modern drains use rubber gaskets instead of putty — check your new assembly to see which it requires.

What if the nut under the sink will not budge?

explore penetrating oil like WD-40 and wait 15 minutes, then try again. If it still will not turn, wrap a rag around the nut for better grip and use a larger wrench or a pipe wrench for more leverage. Never force it hard enough to strip the threads — steady pressure is better than sudden jerking.

Can I replace just the stopper without replacing the whole drain?

Sometimes, but usually not. The stopper and rod are sold as part of the complete assembly. If only the stopper is broken, you might find a replacement stopper alone, but it must match your exact drain model. It is usually simpler and cheaper to replace the entire assembly.

How long does plumber's putty take to dry?

Plumber's putty does not fully dry — it stays soft. You can turn the water on when ready after installation. It will firm up slightly over a few hours but will remain pliable enough to remove the drain later if needed.

What is the difference between a pop-up drain and a regular drain?

A pop-up drain has a stopper that moves up and down via a rod connected to a lever or knob. A regular drain has no stopper mechanism — water straightforward flows down. Pop-up drains are standard in bathroom sinks; regular drains are more common in kitchens and showers.