You opened up the cabinet under the sink and noticed a puddle of water. The most likely culprit is the kitchen sink drain. The seal between the sink drain flange and the sink can become cracked, causing the leak. Once you know how to replace a kitchen sink drain, it will only be a matter of hours before the problem is solved.
- Skill level:
- Moderately Easy
Things you need
- Pipe wrench
- Putty knife
- Plumbers putty
- Plumbers tape
Remove the sink trap from the sink drain by unscrewing it with a pipe wrench.
Insert the handles from a pair of pliers into the sink strainer. This will help prevent the entire drain assembly from moving while loosening the locknut underneath.
Remove the locknut underneath the sink that holds the sink drain to the sink using a pipe wrench. Once it has been loosened with the pipe wrench, you can finish unscrewing it by hand.
Insert a putty knife between the sink drain flange and the sink. Gently work it around the entire sink flange to loosen the old putty. Lift the sink drain up and out of the sink.
Clean away all of the old putty residue from the sink. Make sure that there is no old putty left or the new sink drain may leak because it will not get a good seal.
Roll a thin bead of plumbers putty into a rope and place it around the perimeter underneath the new sink drain flange. Also place a small bead of putty on the surface of the sink around the sink drain hole.
Insert the new sink drain into the hole and gently squeeze it down.
Attach the new locknut to the sink drain from under the sink by threading it on by hand. Once it is hand tight, finish tightening it down with a pipe wrench.
Wrap plumbers tape around the threads of the sink drain where the sink trap will connect. This will help prevent leaks at this connection.
Reconnect the sink trap to the sink drain by attaching the retaining coupling using a pipe wrench.
Remove the excess putty from around the sink drain using a utility knife to cut it away from the perimeter.
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