The 36 FT 3-1/2 ID X 1/2 Wall Semi-Slit Black Poly Pipe Insulation Tube by Jones Stephens is designed for effective thermal insulation in plumbing and HVAC applications. With an inner diameter of 3-1/2 inches and a half-inch wall thickness, this semi-slit tube provides excellent insulation properties while allowing for easy installation over existing pipes. Made from high-quality polyethylene, it is resistant to moisture and UV degradation, ensuring longevity. This insulation tube is ideal for both residential and commercial use, helping to maintain optimal temperatures and reduce energy costs.