Detailed Product Description GF series PVC pipe extrusion lines are mainly used for all ... of conical twin-screw extruder, vacuumcalibrator,hauler, cutter and stacker.1)Imported AC frequency conversion speed regulatorsare applied in the extruderand ... components are equippedin the vacuum pump and hauler motor. 3)There are two-pedrail, three-pedrail,four-pedrail, and six-pedrail haulers for choice.4 ...