OEMic Plasma Slot Screen (PSS) Houston. Midland. Alberta "Big Brand Quality but Better Price" Major parts interchangeable with big brands API Certified Products, Exceptional Service, and High Quality Distributed by IBYOutlet.com Quote: Quote@One-Stop-Savings.com PSS is structurally same to traditional slot screen liners which all have slots on the API standard casing for filtration purpose. However, PSS's slots are worked out by plasma technology, not by milling or laser cutting.