Apache, 1 1/2 Part E Male Cam. Polypropylene cam and groove couplings are manufactured from a glass-filled polypropylene compound, and are designed for use in low to medium pressure applications up to 125 PSI @ 70?F. They come standard with stainless locking arms, stainless pins, and EPDM gaskets, which makes them ideal for transferring diluted chemical solutions.