Features: Large flow rate is possible even in small shapes. This valve allows air to flow in one direction only and does not flow in the opposite direction. Uses: This valve allows air to flow in one direction and does not flow in the opposite direction. Specifications: Connection diameter: Rc1; Depth: 1.9 inches (49 mm); Height: 3.1 inches (80.0 mm); Width: 1.9 inches (49 mm); Effective cross-section: 8.9 inches (225 mm); Specifications 2: Fluid uses: Air, non-corrosive gas, and low viscosity (250 x 10 - 3 mm) No freezing Working Pressure: 0.05 - 1 MPa; Air Flow Rate: 22.8 - 39.4 gal/min (1,000 - 1,4900 L/min)