Dixon 2 1/2 in. Sand Cast Aluminum Cam & Groove Couplers Dixon Couplers and Adapters are constructed from 356T6 aluminum with standard Nitrile Rubber seals installed in the couplers. Features Maximum Operating Pressure: 150 psi Produced to interchange with all product produced to Commercial Item Description A-A-59326D Precision machined to rigid tolerances Couplers are supplied with a Nitrile Rubber gasket