The 4 in 1 Rain Collar is designed to fit 1.25 inch, 2 inch, 3 inch, and 4 inch pipes. It offers a quick and easy solution for repairing the elastomer sealing collar on all types of residential no caulk roof vent flashings. This collar eliminates the need for messy mastic or caulking repairs, allowing you to fix leaks instantly even during wet condition, until you are ready to replace the flashing later. Perfect for fast, reliable fixes.