... : gray cast iron 2. Application: B B type cast iron pipe fittings for drainage GB/T12772-2008cast ... BEND, WYE, DOUBLE WYE, SAN TEE, VENT TRAP, etc.Surface finish: Anti-rust paint or no-shining ... : Steel cases.3) Couplings. we have ASTM A564 TYPE, TYPE B, E, CHA, for EN877 standardsMaterial: 300 series ... steel and EPDM rubber.Packing: Cartons. B type cast iron pipe fittings for drainage GB/T12772-2008 ...