A kitchen sink tap is a small faucet that is attached to a pipe and used for washing and rinsing dishes, filling pots, and draining cooking water. A sink tap is typically controlled by a lever or a knob. A kitchen tap typically has a water supply line and a drain line. The supply line is connected to the faucet and the drain line is connected to the main drain in the sink. The faucet is usually controlled by a lever or knob.