Material: Hose barb fittings are made of solid brass, sturdy construction, excellent corrosion and wear resistance, more durable than plastic or galvanized fittings. Size: 1“ barb (1” ID hose) x 1“ NPT (actual thread diameter is 1.315”), there is a size chart in the link, please check it before purchasing. Superior Performance: Brass air hose barb fittings are an excellent solution for connecting hose and ductwork and can withstand operating temperatures up to 100 °C (212 °F). Ensures proper operation in a wide range of environments in extreme heat or cold. Hose barb fittings are used to connect pipes or fittings with different ends and diameters. When used with hose clamps or crimp sleeves or ferrules (not included), the male threaded end has a deep, smooth thread that ensures stronger bite and sealing performance, providing a reliable, solid connection. Wide range of applications: hose barb fittings are widely used in home brewing, water supply systems, pneumatic tools, oil, gas, agriculture, industry, etc. and are a reliable choice 1