PVC Insulated Fitting Covers and Jacketing For insulating and protecting indoor/outdoor commercial and industrial piping systems, PVC insulated fitting covers and jacketing are the ideal replacement for aluminum, stainless steel, and many others insulation coverings. Fitting covers and PVC jacketing are specifically designed for industrial and commercial applications. Because of their added thickness and thickness distribution, they exhibit excellent impact resistance, durability, superior UV resistance and reduced chance of “burn through” when solvent welding.