The F318 16 25 HD Black Double Ply Black Poly R-8.0 from Mueller Streamline is a premium insulation product designed for maximum thermal efficiency. With an impressive R-value of 8.0, it significantly reduces heat transfer, making it ideal for high-performance HVAC systems. This insulation features a heavy-duty double ply construction, ensuring durability and resistance to environmental factors. Measuring 16 inches in diameter and 25 feet in length, it is compatible with standard piping systems. The black polyethylene material provides excellent moisture resistance, ensuring longevity and reliability in various applications.