Our patented MULTISTOP water trap has been designed with a special seal plate which closes the water trap when not in use. Thus, bad odors are prevented from penetrating from the sewer into the room. In addition to functioning as a water trap and an odor stop, our MULTISTOP water trap has a third function, as the special seal plate used in the MULTISTOP water trap closes the water trap in case of rising water from the sewer, preventing water rising through the grating onto the floor.