Panduit HST1.5-12-5Y Thick Wall Heat Shrink, Adhesive-Lined, Black (5-Pack) Shrink ratio of 3:1 insulates a wide range of diameters and irregular shapes, which reduces inventory costs Cross-linked, UV resistant material improves flame retardancy, chemical, and temperature resistance Thick wall product seals and insulates in one step to speed installation Meets Mil Spec AMS-DTL-23053/15 Class 1 Thick wall suitable for direct burial according to UL 486D and provides excellent protection, used for wet locations