Dual wall adhesive lined heat shrink tubing is ideal for producing strong, weathertight seals on any heat shrink installation. During the application of heat from a heat gun or other heat source, the inner adhesive wall melts and flows, creating an adhesion layer to ensure a snug fit to your harness and/or connector. This glue lined heatshrink tubing is available in 4' strips, in diameters up to 1 1/2".