Whitmore Air Sentry Model: X521 Dimension: 5'' DIA x 7'' TALL 2'' MNPT   Specifications: Check Valve PSI In/Out: 0.1/0.1 Height Inches (cm): 7 (17.8) Diameter Inches (cm): 5 (12.7) Mounting Connection: 2" MNPT Silica Gel LBS (kg): 1.4 (0.6) Maximum Adsorption Capacity FL. Ounces (ml): 8.6 (254) Maximum Air Flow CFM: 20 Maximum Reservoir Fluid Flow GPM: 150 Type Of Medium: 100% Silica Gel Uses Replacement Cartridge: A-343