WET-SHRINK Thick Wall Adhesive Lined Heat Shrink, 0.75 Inch (19.1 mm) Diameter, 0.22 Inch (5.6 mm) Maximum Recovered Inside Diameter, 6 Inch Lengths, 10 pieces, Black. Thick Wall Heat Shrink provides excellent protection above or below ground level and is suitable for wet locations and direct burial (UL486D), Adhesive-lined inner wall seals and protects against moisture, UL Recognized for sunlight (UV) resistance and VW-1 flame rating for outdoor applications such as solar and wind. Shrink ratio of 3 to 1 insulates a wide range of diameters and irregular shapes. which reduces inventory costs, Cross-linked, ultraviolet resistant material improves flame retardancy, chemical, and temperature resistance. Thick wall product seals and insulates in one step to speed installation. CSA Certified. Meets Military Specification AMS-DTL-23053/15 Class 1.