Dixon 3040-DA-AL Aluminum Cam and Groove Reducing Hose Fitting, 3" Socket x 4" Plug Straight body with two openings for connecting two hoses or pipes with cam and groove fittings One female cam coupler end for connecting to male groove adapters and one male groove adapter end for connecting to female cam couplers Aluminum for resisting corrosion and tarnishing Cam lock levers for locking the fitting's male groove adapter into female cam couplers