Tap reseaters are used to fix one of the possible causes of a leaking tap. A leaking tap can be caused by multiple things and is dependent on the type of tap you have. A leaking tap is most commonly caused by general wear and tear of its parts.
Tap reseaters repair compression washer taps. The flow of water from a compression washer tap is stopped and started by the movement of a rubber stopper (washer) against a hole (seat) inside the tap body. Tap reseaters repair the seat of a tap.