The 42-foot semi-slit black poly pipe insulation tube by Jones Stephens features a 3-5/8 inch inner diameter and a 3/8 inch wall thickness. This insulation is designed to minimize heat loss in piping systems, making it perfect for HVAC and plumbing applications. The semi-slit design allows for quick and easy installation over existing pipes, ensuring a tight fit. Constructed from high-quality polyethylene, it is resistant to moisture and chemicals, ensuring durability and longevity. This product meets industry standards, making it suitable for both residential and commercial projects.