Turn off the water. If you have a garbage disposal, turn off the main circuit breaker switch for the disposal before proceeding.
Loosen the drainpipe with the adjustable wrench. If you see nuts and bolts connected to the underside of the sink, loosen the nuts instead, and gently push the bolts upward.
Lift out the flange on the top side of the sink. The flange is the framing of the sink drain and is thin metal. Carefully inspect the rubber gasket underneath for cracks or tears. The gasket is rubber and generally black in color, and is exposed once you life off the flange. If the gasket is torn or cracked, remove it and replace it with a new gasket.
Apply plumber's putty around the inner edge of the sink opening where the opening meets the gasket. Pop the flange back in place.
Apply some plumber's putty in the small gap between the underside of the flange and the pipe or garbage disposal top where the nuts and bolts connect.
Tighten the nuts, which squeezes the putty further between the sink and pipe. Do not overtighten.
Things You Will Need
- Adjustable wrench
- Plumber's putty
- New gasket
- If the flange is one piece connected to a garbage disposal, you may need to call a plumber to repair or replace the disposal itself.