1,Water pipe machine 2,Nearly twenty years experience ... Europe, Africa 4,Plastic pipe 5,CE SJ90PVC coated water pipe production line 1.SJ90/28 single screw extruder ... D ratio 28/1 Screw material 38GrMoALA Heat treatment type nitriding treatment Surface hardness HV940~1050 Nitriding depth 0.6 ... back , left and right , up and down3,cooling water tank 2M Material stainless steel4,tractor and winder into one ...