Water-closet for vehicles, particularly motor coaches

In a water-closet for a vehicle including a completely closed sewage container for receiving faecal matter and sewage therein, said vehicle having a pressurized air supply system for operating brakes, doors, ventilation flaps and the like, said system including a compressor operable continuously during operation of the vehicle engine to supply pressurized air to a pressure tank, a pressure regulator for controlling the air pressure in the pressure tank, and a bypass duct connected to the regulator for exhausting excess air from the system when the pressure tank is at its operating pressure, the improvement comprising a tube extending into the container to a point close to the bottom of the container and connected to the bypass duct of the pressurized air supply system to continuously supply aerating air to said container during operation of the vehicle engine and when the pressure tank is at its operating pressure and to substantially continuously aerate faecal matter in said container during vehicle engine operation.