... . 2.suitalbe for ventilation and air conditioning system. 3.not expensive WH00228 plastic pipe ,food grade plastic pipe,plastic coated ... pipe ,food grade plastic pipe,plastic coated steel pipe detailNot easy to be flatten, can work under both vacuum and high ... DEHP, DNOP, DN, phenyl phthalate), phthalate and Latex additives. It is unscented, with water repellent smooth inner wall, can be sterilized ...