Index: Part No: Description: 1 3740-2PA Black Regulator Bonnet S/A 2 440-8 Spring Retainer (Zinc Plated) 3 440-7H Spring High Pressure Red 4 3740-9N Acetal Bonnet Gasket New Style 5 3740-6T Diaphragm Assemby 6 740-3C Seat Assemby 7 5605 0-160# Air Gauge 8 6603-2000 0-2000# Air Gauge 9 2104 1/4" Flare Washer 10 5436 1/4" SAE Outlet Sitting with Check 11 3740SN-1 Regulator Body 12 440-13 Nut, CO2 13 740-12 High Pressure Inlet 14 440SN-2N Safety Cap 15 440SN-4H Safety Spring 16 5740-1902 Retainer 17 440-1901A Satety Stem Assembly 18 440-5 Stem Spring