Question: I recently installed a new faucet and see that I have a small leak in the drain assembly area. It looks like it is at the top of the tail pipe where it connects to the base of the sink. How can I fix this leak?
Answer: First, go to your local home improvement store and pick up some plumbers putty. Plumbers putty is key to eliminating your link.
The drain tail pipe screws into the drain assembly nut that sits in the bottom of the sink. Apply a bead of plumbers putty to the bottom side of this nut. The bead should be about ¼ inch thick and should rap around the back side of the nut.
Once you have attached the bead of plumbers putty to the backside of the nut, screw the tail pipe into it from the bottom of the sink (in the cabinet area).
Before tightening the tailpipe into the drain nut make sure there is a large rubber washer sitting between the metal flange at the top of the tail pipe and the underside of the sink.
Tighten carefully with a pair of large channel lock pliers and your leak should be a thing of the past.