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