American Standard 3 inch Flapper Valve Replacement High Durability Silicone Seal Ring for No Leaks High Tec Counterbalance stays up longer and flushes cleaner You only have to flush once Made of High Quality ABS Nylon Polymer American Standard 3 inch Flapper Valve Replacement with Silicone Seal and Counterbalance. High Durability Silicone Seal Ring for No Leaks. Hi-Tec Counterbalance stays up longer to release all the water in the water tank and flushes cleaner. You only have to flush once. New Generation flush valve, latest technology in flush valves.