Toilet tank flappers are a part of the flush valve that physically opens to release the water from the tank to flush the waste out of the toilet bowl. Not all flush valves have flappers. Flappers can be made from various materials such as rubber, plastic, or a combination of plastic and rubber. Replacement flappers can be Original Equipment Manufacrture, aftermarket U.S.A. made, and aftermarket foreign made. Some of the manufactureвЂ™s trip levers that North Shore Faucets, Inc. carries are: American Standard, Briggs, Case, Coast, Crane, Delta, Eljer, Gerber, Icera, Indiana Brass, Icera, Kallista, Kohler, Lavalle Industries, Mansfield, Porcher, Saint Thomas Creations, Toto, Generic Universal, Universal Rundle, Wolverene Brass.