The Master Flow 10 in. to 8 in. x 8 in. Wye is made of 30-Gauge, galvanized steel. The joint is used to transition from 1 pipe to 2 pipes in a heating and air conditioning application. It can be installed with sheet metal screws not included. The wye has a maximum temperature rating of 390°F.30-Gauge, galvanized steelDesigned to transition from 1-pipe to 2-pipes in a heating and air conditioning applicationInstall with sheet metal screws not includedMaximum temperature rating of 390 degrees FahrenheitAlways insulate ductwork for greater system efficiency and comfortSeal seams with code-approved mastic, sealant or duct tape not included