Dixon S42 Plated Iron Hose Fitting, King Short Shank Suction Coupling with Plated Iron Nut, 4" NPSM Female x 4" 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 Plated iron for strength, malleability, ductility, and resistance to corrosion Rubber gasket for high elasticity and resistance to abrasion and impact forces Plated iron nut for tightening the assembly with a wrench