Npt Thread: 1/2" Npt x 14 Tpi Female (Actual Nominal Thread Size 7/8") to Npt Thread: 3/8" Npt x 18 Tpi Male (Actual Nominal Thread Size 5/8") Forged Brass Elbow Fitting. Reusable and can be used for applications involving pneumatics, vacuum, and general fluid handling. Can be used for water (non-potable), fuel, gas, cutting fluids, coolants and oil. 90 Degree Shape