Dektite Square Base High Temperature Silicone - Metal Roofing Pipe Flashing BootsMany sizes to fit your pipe size. Boot Size Fits Pipe Outside Diameter Pipe Boot Base Size #1 1 4" 2 1 2" 5 1 2" #2 1 1 2" 3" 7" #3 1 4" 4" 8 1 2" #4 3" 6 1 4" 11" #5 4 1 4" 7 1 2" 12" #6 5" 9" 14" #7 6" 11" 18" #8 7" 13" 19 1 4" #9 10" 19" 26 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 on uneven metal