Fitting is interchangeable with black cast-iron or steel. - For low-pressure plumbing applications including air, water, natural gas, and steam. Pipe Fitting Material / Malleable Iron Class / Class 150 Fitting Side A Nominal Pipe Size / 1/8 in Fitting Side A Gender / Female Fitting Side A Type / NPT Fitting Side A Pipe Threading / 27 Fitting Side B Nominal Pipe Size / 1/8 in Fitting Side B Gender / Female Fitting Side B Type / NPT Fitting Side B Pipe Threading / 27 Color / Black Standards / ASME B16.3, ASTM A197, FM Approved, IAPMO, UL Listed