The HRSR-300FR-8/NM is a high-performance heat shrink tubing designed for use in HVAC applications. Made of black Irradiated Modified Polyolefin, this tubing has a shrink ratio of 5:1, ensuring a snug fit around cables and wires. With a shrink temperature of 80 °C and an operating temperature range of -55 to 110 °C, it provides reliable insulation and protection. The recovered diameter is 20 mm (.788 in), while the expanded diameter is 3 in (76.2 mm), accommodating a wide range of cable sizes. This product, also known by the aliases CU3844-000, is ideal for abrasion protection in wire and cable management, offering high performance and durability.