A closet flange (the drainpipe flange to which a flush rest room is hooked up) is really a specialized flange designed to be flush with the floor, enabling a rest room to get mounted over it. Valve is a device that regulates, controls or directs the movement of a fluid http://valves-and-fittings13456.diowebhost.com/22546829/the-fact-about-valves-and-fittings-that-no-one-is-suggesting