Sloan OEM part. Molded rubber disk with brass core and threads. Located between the relief valve and the diaphragm in many Sloan manual flushometers including Regal, Royal, and Series 900.
aka: 5301111
Note: This part is only for manual sloan flushometers with diaphragm style valves. It is not for piston valve type flushometers. Sensor flushometers use flush volume regulators instead.
