T U V W Y A ABS - Acrylonitrile Butadiene Styrene: A rigid black plastic pipe used for Drain, waste, and vent lines. Aerator : A device screwed into the end of a faucet spout.... on the suction side of a pump caused by an air bubble in the line. Angle Stop : A shutoff valve between the water pipes and a faucet. Its inlet connects to the water supply pipe... in a wall, and its outlet angles up 90 degrees toward the faucet. These are usually used to shut off water to a fixture in case of an emergency repair rather than daily usage. Anode Rod...