... : B B type cast iron pipe fittings for drainage GB/T12772-2008cast iron drainage pipe and fittings, soil pipes, cip, pipe ... in sanitary Drain, Waste, and Vent, sewer drainage applications. Compared with plastic(PVC) pipes, cast iron pipe is more durable. ... completely recycled, it has become architects' first choice for drainage inside the building.1) For no-hub pipe: Standard: EN877, ISO6594; ...