Sloan Part 0301161 A-156-A Flushometer Diaphragm-Only, For Regal & Old Style Royal Flushometers (aka: 5301188)

Sloan OEM part. Flushometer diaphragm (only). Together with the release valve, controls the flow and volume of water released when a manual flushometer is flushed.  (aka: 5301188) This part is used in combination with various release valves found in Regal, Optima, and older Royal style flush valves. aka: 5301188