Frost King F13XAD Pre-Slit Tubular Fiberglass Cover with Self-Sealing Jackets (Bulk) for 1-1/4" Pipes Measures 3 feet in length Commercial grade high temperature self sealing fiberglass tube 1/2 thick and 3 feet long with reinforced foil & paper wrap Used for pipes immediately exiting furnace and water heaters, where foam pipe insulation might not be appropriate If your ductwork and your hot water pipes are not properly insulated or not insulated at all, you could be wasting up to 40% of your monthly home energy bill Frost Kings pipe and duct insulation solutions not only save you money, theyll make your air conditioning and hot water heater work quickly and efficiently