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 polycarbonate and silicone, Qosina part # 11584 has a unique red housing and features a 0.130 inch OD tubing port on each end. This In-line valve has a low, 0.112 psi cracking pressure, which determines when the component starts to open. The duckbill valve style is ideal for applications where back pressure is a concern. 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.