How do I adjust or fix a sink pop-up stopper?

When you lift the little rod behind the faucet, a chain of parts under the sink turns that motion into up-and-down movement of the stopper. The lift rod moves a link, the link moves a horizontal rod that passes into the drain body, and that rod tilts the stopper up or down. A spring clip holds the link on the lift rod. A nut on the drain body holds the horizontal rod in place and keeps it from leaking.

Move any one of those links and the stopper sits differently. That is why one adjustment can fix both a stopper that will not seal and a stopper that will not open far enough. Kohler's guide for pop-up drains puts the fix simply: "If the drain stopper is not moving or closing, check the adjustable link."

Get under the sink with a flashlight. Then follow Kohler's steps:

1. 1Remove the clip. Kohler says to "remove the clip that holds the link in place by squeezing the clip ends together."
2. 2Move the linkage. Kohler says to "move the linkage up or down to a different hole to adjust the stopper movement."
3. 3Put the clip back and test. Work the lift rod and watch the stopper. Fill the basin a few inches and see whether it holds water.

Kohler does not say which direction to go, because it depends on where your link sits now and what is wrong. The logic is what you are changing: how far the stopper rises for a given lift of the rod. A different hole changes that travel. Move one hole, test the stopper both open and closed, and move back if it got worse. If neither direction gets it right, the problem is not the linkage. Look at the stopper itself.

Take a photo of the linkage before you change anything. It costs nothing, and it shows you exactly where each part sat if you need to return to the start.

Kohler also notes that your parts may vary and points to the written installation instructions that came with your drain. Manufacturers differ, and the instructions for your faucet and drain are the best guide for your exact model.

Match the symptom to the likely cause before you start, so you do not take the whole thing apart for nothing:

• The basin will not hold water. The stopper is not seating. Either the linkage holds it slightly open, or hair and film on the seal keep it from closing tight. Adjust first, then clean.
• The basin drains slowly with the lift rod fully up. The stopper is not rising far enough, so it still blocks part of the opening. Adjust the linkage for more travel, and check for hair wrapped around the stopper.
• The lift rod feels loose or does nothing. The spring clip may have come off, or the link may have slipped off the lift rod. Look under the sink. This is usually a ten-second fix.
• The stopper drops or sticks partway. Mineral film or a bent rod can bind it. Remove, clean and inspect for a bend.

If adjusting does not help, take the stopper out and look at it. Hair and soap scum collect on it, around the pivot opening and in the drain body below. Delta Faucet points out that a shower strainer often accumulates "hair and soap scum as well," and that debris, not the hardware, is often the drainage problem.

Kohler's removal instruction is short: "unthread the rod nut, pull the ball rod out, and remove the stopper from the drain." Here is the full sequence for a typical lift-rod stopper:

1. 1Clear the cabinet and put a bucket under the drain, because a little water can come out when the rod comes out.
2. 2Squeeze and remove the spring clip, and keep it in a safe place. It is small.
3. 3Unthread the nut on the drain body, and pull the horizontal rod out. Note which hole in the link the rod sat in, so you can put it back.
4. 4Lift the stopper straight up and out.
5. 5Clean it. Warm soapy water and an old toothbrush remove most of the film. Pull hair out by hand.
6. 6Look into the drain body with a flashlight. If you see hair, clear it with a hooked wire, the way Delta describes for showers, taking care not to push it deeper.

Do not run the faucet while the stopper and rod are out. With the rod removed, the opening it passed through is open, and water sent down the drain can come out there and into the cabinet.

Some stoppers are simpler. A lift-and-turn or push-and-pull style comes straight up when you turn or pull it, with no linkage under the sink. If yours has no lift rod behind the faucet, try that first.

Putting it back is the removal steps in reverse. Set the stopper in the drain, feed the rod through the nut and into the same hole in the link, and thread the nut on until snug. Hand-tight and a slight snug with pliers is enough. Overtightening can crack plastic fittings. Reconnect the spring clip, then run the faucet and check for drips at the nut. If it drips, snug the nut a little more. If it keeps dripping, our leak under the sink page walks through what to look for.

If the stopper's seal or the small parts are worn, cracked or missing, replace the stopper or the whole pop-up assembly with one made for your sink. Bring the old parts to the store so the size matches. That is a job for the same tools, and it is worth doing if cleaning did not restore the seal.

Then test again: fill the basin, watch whether the level drops, and lift and lower the rod a few times.

If the sink drains slowly with the stopper fully open and clean, the blockage is in the trap or the pipe past it. The trap is the curved pipe below the drain. The plumbing code requires each fixture to be "separately trapped by a liquid-seal trap," and the seal must be "not less than 2 inches" and "not more than 4 inches," per IPC 2024 Section 1002. That low bend is also where debris settles. AAA lists checking the P-trap as a standard step, and our slow-draining sink page walks through it.

If the same sink keeps clogging after you clean the stopper and trap, read why the same drain keeps clogging. Hair caught on a stopper again and again is one of the most common reasons. HQ Plumbing & Air gives free estimates if you would rather have it handled.