Dixon AD300EZ Aluminum 356T6 EZ Boss-Lock Type D Cam and Groove Hose Fitting, 3" Socket x 3" NPT Female Cam and groove fitting with handles that remain locked when engaged to help prevent disconnects One female cam coupler end for connecting to male groove adapters and one NPT female threaded end for connecting to an NPT male threaded connection (Type D) Aluminum for resisting corrosion and tarnishing Corrosive-resistant investment cast stainless steel cam lock levers for locking the fitting's male groove adapter into female cam couplers Nitrile butadiene rubber seal rated for petroleum service, ethanol to E100, and biodiesel to B20