Home default Multi-level back-pressure of pre-plastic and pre-speed are computer-controlled, anti- drooling and automated auto purge. Multi-level back-pressure of pre-plastic and pre-speed are computer-controlled, anti- drooling and automated auto purge. Pvc Pipe December 16, 2019 Share: Facebook Twitter Pinterest Multi-level back-pressure of pre-plastic and pre-speed are computer-controlled, anti- drooling and automated auto purge. ... Click to read moreOthers news: Another news: