A sink drain has a flange that is sealed to the sink hole with a bead of plumber's putty. This flange is screwed into the drain body, which is tightened to the underside of the sink bowl with a locknut. The tailpiece, which may contain a pop-up stopper, attaches to a drain trap with slip-joint couplings.

A sink trap remains filled with water so sewer gasses won't enter; it's connected to a threaded nipple inserted in a T in the drain line. An escutcheon trim hides the connection.

A mechanical pop-up stopper is operated by a system of levers and rods. If this isn't working properly, the solution is usually just a matter of adjusting the clevis screw or the position of the pivot rod.

Flexible supply tubes carry water from shutoff valves at the wall to threaded tailpieces on the faucet base.

Get a Pre-Screened Bathroom Remodeling Contractor