Dixon FAB300 Aluminum Hose Fitting, King Short Shank Suction Coupling with Brass Nut, 3" NPSM Female x 3" Hose ID Barbed Coupling for connecting two hoses or pipes with the same diameter in a straight run Connects to a hose on one end and an NPSM male connector on the other Aluminum for lighter weight and resistance to corrosion and tarnishing Rubber gasket for high elasticity and resistance to abrasion and impact forces Brass nut for corrosion resistance, ductility at high temperatures, and low magnetic permeability