This factory production socket type steel inner diameter 300mm - from 2000mm, according to the customer request can produce 1000mm length - 3000mm, its have reasonable design, works excellent, durable high performance-cost ratio the mold production pipes according to its connection mode into flexible interface tube and tube, flexible rigidity interface cement according to its interface model for influenza b, c,. The processing, installation is stricter, mainly is suitable for the high demand, large and medium-sized pipeline construction.