Dektite Round Base High Temperature Silicone - Metal Roofing Pipe Flashing BootsMany sizes to fit your pipe size. Boot Size Fits Pipe Outside Diameter Pipe Boot Base Diameter #1 1 4" 2 1 2" 5" #2 1 1 2" 3" 6 1 4" #3 1 4" 4" 8" #4 3" 6 1 4" 9 1 2" #5 4 1 4" 7 1 2" 10 3 4" #6 5" 9" 12 1 2" #7 6" 11" 14 1 2" #8 7" 13" 16 3 4" #9 10" 19" 25 1 2" High temp red boots are for extreme temperatures. Designed for Temperatures Between 58F to +429 F. Pipes, Chimneys, Plumbing, Heating, Air Conditioning, Electrical, Exhaust Vents, etc. Seals