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 # 80187 has a 1.5 - 5 psi cracking pressure and features a male luer lock outlet, female luer slip inlet and female luer lock control port. Made of polycarbonate and silicone, this dual check valve enables injection and aspiration from separate ports of a single connector and is ideal for applications that require mixing and continuous filling of two substances. 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.