Viper VaporPatch is an all-weather adhesive vapor barrier pipe boot/patch specifically designed for pipe penetrations and patch work. For ease of installation, Viper VaporPatch contains a pipe diameter template every twelve inches for use when cutting to fit various pipe diameters. Viper VaporPatch also works extremely well for seaming, sealing, patching and hanging all plastictype vapor barrier materials. Viper VaporPatch retains its superior tack in cold, hot, humid and even damp conditions in temperatures ranging from -20°F (-29°C) to 180°F (82°C). The bond strength of Viper VaporPatch increases after adhesion.