Valve Rebuild Kit For Use With Grainger Item Number 4NWZ1 4NWZ4 For Use With Mfr Model Number 8220G401 120/60 110/50 DA 8220G404 120/60 110/50 DA Includes Body Gasket Core Diaphragm/Spring Sub-Assembly Disc Holder Spring Plug Nut Gasket Pug Nut Assembly Solenoid Base Gasket