LASCO 19-9505 Male Hose Thread Adapter Barb Fitting with 1/2-Inch Barb and 3/4-Inch Male Hose Thread, Nylon Nylon barb fitting 1/2-inch barb x 3/4-inch male hose thread adapter Use on I.D. size poly tubing Working pressure 150 psi, up to 175 degree Fahrenheit Do not use with acid based fertilizers, bromine, chlorine, fluorine, xylene or any acids