water inlet and outlet flushing valves in a water closet cistern tank

back ceramic check cistern clog clogging closet concentric difference drain drainpipe dual empty excreta feces float floor flow flush flushing full gush gushing human inlet lavatory leak leaking level low mechanical mode outlet pipe pipes piping press pressure removal remove room sanitary saving sewage shit siphon sit sitting spring squat squatting suck suction tank toilet trap treatment tube tubes urinal urine valve valves wash washroom waste water