... Quality,Good Price 4.ISO 9001:2000 Double-Pipe Extrusion Line(Double-Pipe Production)PVC Double-Pipe Extrusion LineFeatures and Application: The production line ... or host for SJZ65/132 conical twin-screw extruder, match with double tube sheet control stainless steel sprinkler stenters, ... both benefits, double tube extrusion diameter from 20 - 63, can make full use of plastic extruder, squeezing even ...