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Also asked, what is a drain tailpiece?
The tailpiece, or sink tailpiece, is the straight section of pipe that connects to the bottom of the sink drain fitting. Typically, the tailpiece attaches to the drain fitting with a slip nut--a threaded ring that can be tightened and loosened by hand (or with gentle persuasion from channel-type pliers).
In this manner, how do you remove a drain tailpiece?
Loosen the nut connecting the tailpiece — the straight section of pipe that connects the sink to the P-trap — to the drain body on the underside of the sink. Unscrew the tailpiece using a wrench or pliers. Pull down on the pipe to break it free.
Replacing a Sink Drain Instructions: Reach behind your drain and unscrew the cap around the pop-up ball and rod. Remove them from the drain. (FYI, if you ever have a broken pop-up, you can fix your pop-up stopper with this tutorial.) Use your pliers to loosen the nut on the drain and remove it.