Symptoms
- Stopper won't rise or lower when the lift knob is used
- Stopper feels stuck in one position
- Sink drains slowly along with the stuck stopper
- Lift knob moves but stopper doesn't respond
Likely causes
- CommonHair and soap scum built up around the pivot rodDebris wraps around the stopper's base and jams its movement.
- CommonDisconnected or loose linkage under the sinkThe pivot rod or clevis strip connecting the lift knob to the stopper can slip loose.
- PossibleCorroded pivot rodMetal parts under the sink can corrode over years, especially in humid conditions.
- Less commonStopper installed slightly crookedCan bind against the drain opening.
What to do
- Lift the stopper straight up and out of the drain if possible; many just pull up and rotate slightly to remove.
- Clean off any hair, soap scum, or mineral buildup from the stopper and the inside of the drain opening.
- If the stopper doesn't pull out easily, look under the sink for the pivot rod that connects through the drain pipe and gently disconnect it.
- Check the clevis strip and spring clip connecting the pivot rod to the lift rod for looseness or corrosion.
- Clean or replace corroded linkage parts, then reconnect and test movement by hand before reassembling fully.
- Reinsert the stopper, reconnect the pivot rod, and test the lift knob moves the stopper smoothly.
- Run water and confirm the stopper both seals for filling the sink and drains fully when raised.
Tools and parts
- Pliers
- Adjustable wrench
Sink drain linkage kitSearch: “bathroom sink pop-up drain linkage kit”
When to call a pro
Call a plumber if the linkage is badly corroded or the drain assembly needs full replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.