HHydroGuard Breathers Des-Case HydroGuard breathers uniquely feature an expansion chamber and internal check valves that create a nearly-sealed system. Designed specifically for steady-state operations with minimal temperature fluctuations, these breathers provide excellent protection in continuous duty applications. Specifications Unit Height: 7.19 in (182 mm) Unit Diameter: 2.52 in (64 mm) Filter Efficiency: 3μ absolute (β3≥200) Amount of Silica Gel: 0.3 lbs (0.1 kg) Adsorption Capacity: 2 fl oz (50 ml) Max. Flow Rate: 1 cfm (40 lpm) Operating Temp. Range: -20°F to 200°F (-29°C to 93°C) Connection Size: 3/8″ Multi-Fit (NPT, BSPP, BSPT) Suction/Return Rate at 1 psid: 11 gpm (40 lpm) Gearbox/Storage Tank Max. Volume: 50 gal (189 L) Hydraulic Reservoir Max. Volume: N/A