Apache, Poly Dust Cap Cam. Polypropylene cam and groove couplings are manufactured from a glassfilled polypropylene compound, and are designed for use in low to medium pressure applications up to 125 PSI 70F. They come standard with stainless locking arms, stainless pins, and EPDM gaskets, which makes them ideal for transferring diluted chemical solutions. Specifications. Hazardous Material No. Weight 0.6 lbs