1/2 in. hole (0.840 O.D. pipe size) Electric Service Mast Retro-Spin flashing replacement kits include 1 Retro-Spin galvanized Roof Flashing and 1 Retro-Split EPDM rubber storm collar flashing which has been molded for an exact fit onto a specific geometric shaped structural penetration. Each Retro-Spin Flashing kit easily replaces sun damaged, worn out or aging mast flashings without the need to cut the power to a home or business. Expanding rubber flashings that are torn, cut and broken are now easy to replace during re-roof or as an easy DYI repair project. Just order the correct kit that matches the pipe diameter of the electric masts passing through the roof and put into place with a hammer, nails and a screw driver. Spin Flashings kit Retro install from the side and save money compared to hiring electricians or the city to cut power for a slide on the top installation. Retro-Spin slides on and spins closed around round conduit steel, iron, Stainless, PVC, ABS and black pipe types. Unequivocally, the easiest to install, and best looking retro-fit flashing replacement system on the market. Do-It-Yourself and Pros who have pride in their work, always use the best; A Retro-Sin Flashing Kit. The combination of 1 Retro-Spin galvanized steel roof flashings plus 1 Retro-Split EPDM rubber storm collar.