Step-by-step fix
Step 1: Make sure the pop up assembly is really the problem
- Run a little water and work the lift rod up and down several times.
- Look under the sink while the stopper moves. Check for a disconnected pivot rod, a missing clip, a corroded drain body, or a stopper that no longer lines up with the pivot rod.
- Confirm that the sink itself is not cracked around the drain opening and that the trap and tailpiece are not the main source of the leak.
- Clear out obvious hair and sludge from the stopper area so you do not replace parts just because they were dirty.
If it works: You have confirmed the stopper assembly is worn, damaged, badly corroded, or leaking at the drain body or pivot area.
If it doesn’t: If the stopper works once cleaned and tightened, you may not need a full replacement yet.
Stop if:- The sink is cracked around the drain opening.
- The leak is coming from damaged drain piping in the wall or a broken sink tailpiece rather than the pop up assembly.
- Corrosion is so severe that connected drain parts may break apart when loosened.
Step 2: Set up the area and disconnect the old linkage
- Empty the cabinet under the sink and place a bucket or pan below the trap area.
- Lower the stopper to help keep parts from dropping while you disconnect the linkage.
- Unscrew the retaining clip from the clevis strap connection or remove the spring clip, then slide the pivot rod free from the lift rod linkage.
- Unscrew the pivot nut at the back of the drain body and pull out the pivot rod. Lift the stopper out from above the sink.
If it works: The stopper, pivot rod, and lift rod connection are disconnected and ready for drain removal.
If it doesn’t: If a nut is stuck, apply steady pressure with pliers or a wrench instead of forcing it suddenly.
Stop if:- A metal rod or nut starts twisting the drain body enough to crack the sink or damage the faucet area.
- You cannot access the linkage safely because the sink base or cabinet is damaged and unstable.
Step 3: Remove the old drain body
- Loosen the slip nut or connection below the sink so the drain tailpiece is free from the trap or extension tube.
- From under the sink, loosen the large locknut holding the drain body to the sink. Use pliers or a basin wrench if needed.
- Push the old drain body up and out through the sink opening. Remove the flange and any old putty or gasket material from the top and bottom of the sink.
- Keep any washers and nuts nearby only as a reference for the order of the new parts, not for reuse unless the new kit specifically calls for it.
If it works: The old pop up drain assembly is out and the sink opening is exposed.
If it doesn’t: If the drain body spins, hold the flange from above while loosening the locknut from below.
Stop if:- The sink opening is chipped badly enough that a new drain will not seat flat.
- The trap or wall drain connection breaks loose or starts leaking from a separate joint you were not working on.
Step 4: Clean the sink opening and dry fit the new parts
- Scrape and wipe away all old putty, mineral buildup, and grime from the sink drain opening and the underside where the gasket will sit.
- Dry fit the new flange, drain body, washers, and locknut so you understand the order before sealing anything.
- Check that the pivot rod opening on the new drain body will face the back of the sink when tightened.
- Compare the new stopper and pivot rod to the old parts so the lift range and linkage style make sense.
If it works: The sink opening is clean and you know how the new assembly will go together before final installation.
If it doesn’t: If the new parts do not line up or the sizes do not match, pause and verify the replacement before installing it.
Stop if:- The new assembly does not fit the sink opening or cannot connect to the existing drain piping without forcing mismatched parts.
Step 5: Install the new pop up drain assembly
- Apply plumber's putty under the drain flange if your new assembly uses putty, or follow the new assembly's gasket style if it does not.
- Set the flange into the sink opening from above. From below, install the gasket, washer, and locknut in the correct order.
- Tighten the locknut until the drain body is snug and the flange sits flat, with the pivot opening facing the back of the sink. Do not overtighten and distort the sink or gasket.
- Reconnect the lower drain connection to the trap or extension tube and snug the slip nut.
- Insert the stopper from above, then slide the pivot rod into the drain body so it catches the stopper hole or slot. Tighten the pivot nut enough to seal while still allowing smooth movement.
- Reconnect the pivot rod to the clevis strap and lift rod, then adjust the clip position so the stopper opens fully and seals when lowered.
If it works: The new drain body is installed, the linkage is connected, and the stopper moves up and down with the lift rod.
If it doesn’t: If the stopper does not seal or lift enough, move the pivot rod to a different hole in the clevis strap and test again.
Stop if:- The sink flexes, creaks, or shows cracking while tightening the drain.
- A gasket squeezes out unevenly or the drain body will not sit straight even after loosening and resetting it.
Step 6: Test for leaks and make sure the repair holds in real use
- Wipe all joints dry under the sink so new drips are easy to spot.
- Close the stopper, fill the sink partway with water, and let it sit for several minutes. Check around the flange, pivot nut, and slip nuts for moisture.
- Open the stopper and let the sink drain while watching the pivot area and the trap connection below.
- Run the faucet again and cycle the stopper several times to make sure it seals, releases, and drains smoothly during normal use.
If it works: The sink holds water when closed, drains normally when opened, and stays dry at the drain body, pivot nut, and connected piping.
If it doesn’t: If you find a small leak, gently retighten the leaking connection or reset the flange seal if the leak is at the top of the drain body.
Stop if:- Water continues leaking from the sink opening after resealing and retightening.
- The sink drains poorly even with the new assembly installed, which points to a clog farther down the drain line.
Replacement Parts
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FAQ
Do I need to shut off the water to replace a bathroom sink pop up stopper assembly?
Usually no. You are working on the drain, not the supply lines. Just avoid running water while parts are disconnected and keep a bucket underneath for the water left in the trap.
Should I use plumber's putty or a rubber gasket?
Use the sealing method that matches the new assembly. Many pop up drains use putty under the top flange, while some use a formed gasket. Do not stack extra sealants unless the product instructions call for it.
Why won't the new stopper stay up or down?
The linkage usually needs adjustment. Move the pivot rod to a different hole in the clevis strap and retest until the stopper lifts high enough to drain and drops low enough to seal.
Can I replace just the stopper and keep the old drain body?
Sometimes, but only if the new stopper matches the old drain body and pivot setup. If the drain body is corroded, leaking, or worn at the pivot area, replacing the full assembly is the better repair.
What if the sink still drains slowly after I replace the pop up assembly?
That usually means the problem is farther down the drain line. Remove any visible debris first, then check the trap and branch drain for buildup or blockage.