Sloan OEM part. Diaphragm guide assembly. Includes guide tube, flow ring, and refill head. Used in Regal brand manual flushometers.
This component holds and positions the flexible rubber diaphragm (and relief valve) within the valve body. This allows the diaphragm to regulate water pressure during a flush, effectively controlling the volume of water released and preventing leaks by maintaining a tight seal when the flush cycle is not in process.