Whitmore Air Sentry Model: G8S1NG SILICA - 1'' NPT - WITH COMPOUND INDICATING GAUGE   Specifications: Height: 12 in 30.5 cm Diameter: 5.125 in Mounting Connection: 1" NPT Silica Gel: 2.8 lbs 1.27 kg Maximum Adsorption Capacity: 17.2 fl oz 508.7 mL Maximum Air Flow: 25 cfm Maximum Reservoir Fluid Flow: 187 gpm Type of Medium: Silica Gel Isolation Check Valve: No Compound Indicating Gauge: Yes Cartridge: GRC8S