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 #80173 features a white tubing port inlet and clear tubing port outlet; both ports fit 0.129 - 0.132 inch OD tubing. Made of acrylic and silicone, this in-line valve has a low, 0.3 psi cracking pressure, 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.