Whitmore Air Sentry Model: G12S2NGC SILICA - 2'' NPT - GAUGE & ISOLATION CHECK VALVE   Specifications: Height: 16 in 40.6 cm Diameter: 5.125 in Mounting Connection: 2" NPT Silica Gel: 4.5 lbs 2 kg Maximum Adsorption Capacity: 27.6 fl oz 816 mL Maximum Air Flow: 25 cfm Maximum Reservoir Fluid Flow: 187 gpm Type of Medium: Silica Gel Isolation Check Valve: Yes Compound Indicating Gauge: Yes Cartridge: GRC12SC