It connects to the toilet or to the black water tanks, it is used to empty the toilet or the tank itself. Virtually unblockable, they can run dry, are self-priming and can also be used in vacuum toilet systems. Materials: nylon / fiberglass + Hypalon rubber + brass + stainless steel. Suction and head maximum 3 meters, requires 1 ”/ 1/2 (38 mm) inlet / outlet pipes.