Interstate Pneumatics FM68-5 Brass Hose Barb Fitting, Connector, 5/8 Inch Barb X 3/8 Inch NPT Male End Threads: 5/8 inch Barb X 3/8 inch NPT Male End - Machined (Provides seal tight threads) Temperature Range: -65 F to 250 F Maximum Operating Pressure: 250 PSI Conformance: ASME, SAE, NPT Material: Brass - Excellent strength and ductility, corrosion resistance, low magnetic permeability