Dixon CAB300 Aluminum Hose Fitting, Complete King Short Suction Coupling Set with Brass Nut, 3" NPSM 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 both ends 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