Our PSSV series, self-sealing check valves, are made from either polycarbonate or polypropylene housings with Barb connector sizes for 3/16 inch ID tubing or 5/16 inch ID tubing. The product is made in a class 7 clean room. The seal is a retractable silicone disk that prevents back-flow in several air and liquid applications making it an ideal option for the medical Industry for air applications including respiratory, ventilator, bio-pharmaceutical. The product can also be used with fluid applications for the medical devices. Designed for pressures under 50 PSI. All material are compatible with Gamma Sterilization 6 Mrads, and ETO Sterilization.