Interstate Pneumatics FL146 Easy Lock Brass Hose Fittings, Connectors, 1/4 Inch Push-Lock Barb x 3/8 Inch Male NPT End Threads:1/4 inch Barb x 3/8 inch Male NPT 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