Dual Wall Heat Shrink Tubing With Adhesive is excellent for protecting, insulating, and sealing electrical connections. Made from durable polyolefin which is flame retardant, flexible, an excellent insulator, and resistant to abrasion. Dual wall heat shrink has an thicker outer wall than standard heat shrink and also has a shrink ratio of 3 to 1. This allows the heat shrink to be used in a wider range of applications. The inner adhesive lining flows when heat is applied, encapsulating your connection and creating a permanent environmental seal. Dual wall heat shrink is UL listed and CSA certified, and is great for use on battery cables and other connections that may be exposed to weather or the environment. Dual wall heat shrink is also an excellent product for marine use. Available in sizes from 1/8'' to 1-1/2'' in diameter. Operating temperature of -67°F to 248°F (-55°C to 120°C).