... /T12772-2008 1. Material: gray cast iron 2. Application: B B type cast iron pipe fittings for drainage GB/T12772-2008cast ... molds mainly include: Bends, double bends, single branches, double branches, corner branches, unequal branches, down pipe support, spigot caps, reducer, ... : 300 series Stainless steel and EPDM rubber.Packing: Cartons. B type cast iron pipe fittings for drainage GB/T12772-2008