Below is a list of Poly Tubing manufacturers from Romulus, Michigan. Poly tubing, which is short for polyethylene tubing, is a variety of plastic tubing products that are hollow plastic channels used for the transportation of liquids, gasses and some granular or free-flowing solids. Poly tubing is used in a wide variety of commercial and industrial contexts. Polyethylene, the plastic material from which poly tubing is constructed, is a versatile plastic and can be used to make plastic products of varying thicknesses, strengths, temperature and corrosion resistance, impact resistance and chemical inertness.