Dielectric Flange 4 in Female NPT Zinc-Plated Galvanized Gray Cast Iron 9 1/8 in 4 in Female NPT Zinc-Plated Galvanized Gray Cast Iron 9 1/8 in Number of Bolt Holes 4 Gray 175 psi Maximum Operating Pressure Insulator Material Polysulfone Includes Fasteners No 33 Degrees to 180 Degrees F