Whitmore Air Sentry Model: XR-501 Dimension: 5'' DIA x 7'' TALL 1'' MNPT   Specifications: Check Valve PSI In/Out: 0.1 0.1 Height: 8.5 in 21.6 cm Diameter: 5.2 in 13.2 cm Mounting Connection: 1" MNPT Silica Gel: 1.4 lbs 0.6 kg Maximum Adsorption Capacity: 8.6 fl oz 254 mL Maximum Air Flow: 25 cfm Maximum Reservoir Fluid Flow: 187 gpm Type of Medium: 100% Silica Gel Cartridge: A-351