PT Coupling 6040302530X25FFH Aluminum Cam and Groove Hose Fitting, Adapter, 3" Adapter x 2-1/2" Male Fire Hose (NH) Suitable for connecting to NH female end of fire hose Adapter at one end and NH male fire hose threads at the other Aluminum for lighter weight and resistance to corrosion Suitable for use with water, hydraulic oil, coolants, gasoline, and petroleum products 100% Poured, Casted, and Machined in the U.S.A