Boat and caravan closet

Closet with sewage tank (7) comprising a stand enclosing the sewage tank (7) and supporting a chair (1) having a closet bowl (3), a closet seat (4) and a closet cover (5), and having a flushing water container (18), and said closet bowl (3) being adapted to be closed in a pressure-tight manner by means of the cover (5), said bowl also being provided with a discharge valve (8) which opens at a predetermined overpressure in the closet bowl (3), closet bowl (3) and sewage tank (7) communicating through such discharge valve opening, characterized in that for emptying the closet bowl (3) into the sewage tank (7) means (24, 25, 31) comprising an air pump (24) are provided acting simultaneously to expose both the closet bowl (3) and the flushing water container (18) to over-pressure, said over-pressure continuing to a predetermined amount in the closet (3) to force open the discharge valve (8), and that means (21) are provided supplying flushing liquid from the flushing water container (18) to the closet bowl (3) through the discharge valve opening and into the sewage tank (7) when the discharge valve (8) in the closet bowl (3) has been so opened.