728146 Hardi Pump Check Valve

728146 is the pump check valve for Hardi 500, 503, 600, 603, 320, 321, 361, 363, and 364 series pumps. When changing this check valve always also change the gasket part number 330024.
These check valves are also contained in pump rebuild kits.
500 rebuild kit- 75072900
503 rebuild kit- 75073000
600 rebuild kit- 75073100
603 rebuild kit- 75073200
361 rebuild kit- 75073700
363 rebuild kit- 75073700
364 rebuild kit- 75585900