Features Galvanized to resist rust and corrosion. Nominal Pipe Size / 1 in Fitting Connection Type / Flanged x FNPT Flange Outside Diameter / 3 7/8 in Overall Length / 11/16 in Pipe Fitting Material / Malleable Iron Finish/Coating / Zinc Plated Class / Class 150 Maximum Operating Pressure / 300 psi Number of Bolt Holes / 4 Standards / AB1953, ASTM A197