Abstract: An attachment for a water closet includes a mounting plate which is adapted to be secured on the upper surface of a toilet bowl at the rear thereof immediately beneath the rear end of a toilet seat. The mounting plate carries a section of a water inlet conduit which can be easily attached to a water supply line. A valve mounted on the plate is connected in the inlet conduit and controls flow of water to a nozzle which is carried on the end of a pipe that is mounted on the plate for swinging movement from a retracted position under a side portion of the rim of the bowl to a projected position at which the nozzle is located in an upwardly directed position at about the center of the bowl.