Adopting single or double screw extruder, equipped with corresponding auxiliaries, this line can be used to produce solid rainspout, core-layer foamed pipe, inner-spiral silencer pipe and upvc water supply pipe, which has pressure grade. with different models as rmsz-45 /90; 65 /132; 80 /156 and 92 /188, pipes with diameter from 20mm to 630mm can be produced.