Patent ID: 8015912

Claim:
A diaphragm pump for a pumped shower waste, the pump comprising: a diaphragm housing, a diaphragm removably held in the diaphragm housing, the diaphragm having a diaphragm aperture; an openable cover on the diaphragm housing for accessing the diaphragm, an electric motor, a connecting member positioned in the diaphragm housing and movable by the electric motor, the connecting member having a body, a diaphragm-contacting plate at one end of the body, and a spigot formed centrally on the diaphragm-contacting plate which projects away from the body and is receivable in the diaphragm aperture; and a non-screw-threaded twist and lock fastener having a generally tubular shaped portion with gripping elements on an outer surface thereof and a diaphragm flange extending radially outwardly from the tubular portion, the spigot of the connecting member being receivable in the tubular shaped portion, whereby the fastener releasably engages and liquid-tightly clamps the diaphragm between the diaphragm flange and the diaphragm plate of the connecting member wherein one of the fastener and connecting member includes at least one radially extending wing element and the remaining one of the fastener and connecting member includes a locking recess for receiving and releasably retaining the wing element so as to enable releasable inter-engagement of the fastener and the connecting member by rotation of the tubular portion in an appropriate direction.