... GB/T12772-2008 1. Material: gray cast iron 2. Application: B B type cast iron pipe fittings for drainage GB/T12772 ... fittings, coupling, astm a888, en877, astm a74, bs 437Hubless/socketless Cast Iron Soil/drainage Pipes and fittings has long been employed ... applications. Compared with plastic(PVC) pipes, cast iron pipe is more durable. Furthemore, cast iron pipe has excellent noise suppression and ...