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WSD PC6SM6 PEX-AL-PEX 3/4" Press x 3/4" CU Spigot Sweat Adapter Fitting is designed for use with PEX-AL-PEX piping. Press fitting is a type of fastening between two parts which is achieved through friction. It is friction that holds the parts together. Friction is greatly increased by compression of one part against the other, relying on the strength of the materials to hold together.