Locate the drain stopper/plug type (lift-and-turn, push/pull, or pop-up)
Remove any visible stopper
Lift-and-turn: turn the stopper counterclockwise and pull it out
Push/pull: press down to release, then pull up to remove
Pop-up: unscrew/remove the pivot rod or linkage under the overflow plate, then lift the stopper assembly out
If there’s a lift rod/overflow linkage, remove it from the underside
Remove the drain cover/trim plate screws (if present)
Loosen and remove any retaining ring or mounting nut under the tub
Use a basin wrench or pliers to hold the underside while turning the drain assembly
If the drain is threaded, turn the drain body counterclockwise to remove it
If the drain is sealed with caulk or old adhesive, carefully cut the seal around the flange with a utility knife
Tap gently around the drain flange with a rubber mallet to break the seal
Pull the drain body straight up once loosened
Clean off remaining putty/caulk from the tub surface
If the drain won’t move, apply penetrating oil to the seam and wait before trying again
If needed, remove the overflow plate and detach any remaining linkage before pulling the drain
Replace with a new drain kit using plumber’s putty or the manufacturer’s recommended sealant
Tighten the mounting nut/retainer until snug, then reattach linkage and stopper
Test for leaks by running water and checking around the drain and overflow connection