... used in the building industry as a reliable drainage system for a long time, it can be ... used in sanitary Drain, Waste, and Vent, sewer drainage applications. Compared with plastic(PVC) pipes, cast iron ... completely recycled, it has become architects' first choice for drainage inside the buildings.1) For hubless pipes: Standard: ... 301 seriesMaterial: Stainless steel. Packing: Cartons. iron drainage pipe