Before we proceed to learn how bathroom sinks work, it is important to understand bathroom sink plumbing. Most bath sinks are smaller than kitchen sinks. Plumbing of both is more or less the same.
The sink drain has a flange sealed to the sink hole with plumber’s putty. The flange is then screwed into the drain body. The drain body is then tightened to the underside of the sink bowl using a locknut. A tailpiece with a pop-up stopper is attached to the drain trap with slip-joint couplings. Flexible pipes (in most cases it is a PVC pipe) carry water from shutoff valves to the faucet.
Most bathroom sinks have two fixture holes – one is narrow (4 or 6 inches) and the other one is wider (6 or 8 inches). The wider hole is meant to receive a split-set faucet with the handles separate from the spout.
The narrow holes (4 or 6 inch) may receive a center set or single-lever faucet.
The pop-up stopper fitted with the drainpipe actually raises and lowers when we pull up or push down the handle that protrudes through or behind the faucet body.
This is how bathroom sinks work.
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