How bathroom sink plumbing works, including a diagram of the drain plumbing assembly
A bath sink typically has two fixture holes on either 4-, 6-, or 8-inch centers. The wider types are meant to receive a split-set faucet, with faucet handles separate from the spout. The 4- or 6-inch holes may receive either a center set or a single-lever faucet. Flexible supply tubes carry water from shutoff valves at the wall to threaded tailpieces on the base of the faucet.
The drainpipe that runs through a bathroom sink usually is fitted with a pop-up stopper that raises and lowers when you pull up or push down on a knob or handle just behind the faucet body. The knob is actually the head of a lift rod fastened to a clevis, which is a connecting bar. The clevis connects to a pivot rod-and-ball assembly that consists of a rod that runs