Qosina offers an extensive line of Check Valves, available in a variety of styles that are in stock and ready for immediate delivery. Made of polypropylene and silicone, Qosina part #97352 is respiratory connector with a 22 mm OD inlet x 22 mm ID outlet. This valve provides directional flow of gases and air and has a molded arrow that allows visual indication of the direction of air flow. Qosina offers a variety of flow rates, materials, cracking pressure and back pressure options. Check Valve sample kits are also available which are ideal for testing.