It is connected to the toilet unit or to the waste water tanks, is used to drain toilet units or tanks. Virtually unblockable, can run dry, self priming and can be also be used with vacuum toilet units. Materials: nylon/fibreglass + Hypalon rubber + brass + stainless steel. Maximum suction and head of 3 metres, requires inlet/outlet pipes size 1”/1/2 (38 mm).