Qosina offers an extensive line of Check Valves, available in a variety of styles that are in stock and ready for immediate delivery. Qosina part # 80103 features a white tubing port inlet and clear tubing port outlet, both with a 0.130 - 0.138 inch OD. Made of Acrylic and silicone, this in-line valve has a low, 0 - 0.29 psi cracking pressure range, determining when the component starts to open. 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.