EntityQ665580· pop 27· linked from 330 articlestrapSign in to saveU-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flowConnectionsfittingEntitywashing machineEntitypipeEntityplumbingEntitythermosiphonEntityOnsite sewage facilityEntityInternational Standard Book NumberEntitywater wellEntityRiver ThamesEntitypressureEntitytoiletEntitydrinking waterEntityPalace of WestminsterEntitycorrosionEntitypublic healthEntitypumpEntitybathtubEntityurinationEntitytapEntitysurface tensionEntityCategoriesBathroomsPiping