W1 flexible interface cast iron pipes and fittings are produced based on GB/T12772-2008 “flexible interface cast iron drainage pipes, fittings and accessories” standard. In the installation, stainless steel flexible pipe hoops are used for connection, which are featured by good anti-seismic performance, simple construction, easy maintenance, reliable use, beautiful appearance and durability. The company offers more than 190 varieties and specifications of cast iron pipe fittings and ancillary rubber seal rings with DN50-DN200 apertures.