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Dixon Holedall 12P2 Plated Carbon Steel Hose Fitting, External Swage Uni-Range Male Coupling with Ferrule, 3/4' Hose ID, 1-14/64' -1-18/64' Hose OD: Industrial Hose Fittings: Industrial & Scientific. Dixon Holedall 12P2 Plated Carbon Steel Hose Fitting, External Swage Uni-Range Male Coupling with Ferrule, 3/4" Hose ID, 1-14/64" -1-18/64" Hose OD: Industrial Hose Fittings: Industrial & Scientific. This Dixon Holedall external swage uni-range hose fitting is made of carbon steel and connects hoses in a straight run. It has male National Pipe Taper Fine (NPTF) threads on one end to connect with female NPTF threaded connections for a tighter seal than straight threads and a Holedall ferrule on the other to connect to a hose. This Holedall factory assembled external swage uni-range coupling assembly is made of carbon steel for hardness and strength. The Holedall coupling system uses an external swage ferrule sealed with a hydraulic ram (not included) and can be swaged or crimped. Dixon Holedall stems and ferrules are specifically designed to be used together as a coupling system. Due to differences in dimensions and tolerances, for safety reasons, do not use other manufacturer's stems or ferrules with Dixon Holedall products.。Hose fittings connect, control, change the direction of, and terminate the flow in piping and hose systems. They are made of brass, stainless steel, galvanized steel, and other materials that resist corrosion, pressure, and wear. Hose fittings have various types of connections, including threaded, barbed, push-to-connect, dry disconnect, and others including those based on internationally-accepted specifications. Hose fittings are used in systems such as air compressors, automatic manufacturing operations, aircraft controls, and tire installation in industries including agriculture, mining, road construction, firefighting, and aviation.。 Company manufactures pipe and hose fittings and accessories. The company, founded in 1916, is headquartered in Chestertown, MD.。 。 。 。