Stainless steel rings, arm & pins. Interchangeable with all types of cam lever couplers. Precision molded to insure a uniform & accurate fit. Durable - Polypropylene is glass filled for rugged, durable strength. Smooth operating - finger rings are designed for easy opening of cam levers. Economical and superior in performance. Standard with EPDM gaskets. Maximum operating pressure 300 PSI.