How to Replace a Bathroom Sink Pop-Up Drain

Drainage issues in a bathroom often stem from the mechanical pop-up assembly rather than the pipes themselves. Over time, the metal corrodes, the gaskets turn brittle, or the lift rod mechanism simply stops moving, leaving you with a sink that won't hold water or, worse, won't drain at all. Replacing the drain is a rite of passage for every homeowner. It requires working in a cramped space under the sink, but the process is mechanical and straightforward. Once you strip away the old, calcified parts and install a fresh kit, you regain full control over your vanity's primary function. Done well, this repair leaves you with a watertight seal that looks professional and operates with a crisp, satisfying click.

1. Catch the Water First. Place a bucket underneath the P-trap to catch residual water. Unscrew the slip nuts by hand or with channel-lock pliers and remove the trap arm from the tailpiece.
2. Disconnect the Lift Mechanism. Loosen the clevis screw connecting the vertical lift rod to the horizontal strap beneath the sink. Pull the lift rod out from the top of the faucet assembly.
3. Free the Old Drain. Disconnect the ball rod from the drain pipe by unscrewing the retaining nut. Use a drain wrench or large pliers to loosen the large locknut holding the drain body against the underside of the sink.
4. Strip Away Old Sealant. Remove the old drain flange and scrape away all remnants of old plumber's putty or silicone from the sink basin. Wipe the area clean with denatured alcohol to ensure a fresh, dry surface.
5. Seal and Tighten. Roll a marble-sized amount of plumber's putty into a snake and wrap it around the underside of the new drain flange. Press the drain body through the sink hole and tighten the locknut underneath against the rubber gasket.
6. Verify the Seal Holds. Reattach the P-trap, reconnect the lift rod, and fill the sink to check for leaks at the gasket. Wipe away any excess putty that squeezed out into the basin.