The metal culvert pipe
elements are elastic components in common use with huge quantity. The product technique is special and has many manufacturing procedure. In order to enhance productivity and lower the production cost, we usually adopt the professionalization concentrate production style. At present, as to the metal culvert pipe
, bellow expansion joint, spiral pipe
, they are usually supplied with the manufacturing plant. As to those elastic component which needs high technique, it is usually supplied by the special manufacturer.