- Used to connect pipes of dissimilar diameters.-Made of Galvanized to resist rust and corrosion. Pipe Fitting Material / Malleable Iron Finish/Coating / Zinc Plated Class / Class 150 Fitting Side A Nominal Pipe Size / 1/2 in Fitting Side A Gender / Female Fitting Side A Type / NPT Fitting Side A Pipe Threading / 14 Fitting Side B Nominal Pipe Size / 1/4 in Fitting Side B Gender / Female Fitting Side B Type / NPT Fitting Side B Pipe Threading / 18 Color / White Standards / ASME B16.3, ASTM A197, FM Approved, IAPMO, UL Listed