Garage Door Supply Company is your home for the Windsor P-bulb Garage Door Bottom Weather Seal (Item# WINDSOR-PERFT-8). These seals are designed exclusively for Windsor garage doors and made from a black vinyl compound for strength and durability. The total height of the seal, including the P-bulb, is 1-3/4". Order Windsor P-bulb Garage Door Bottom Weather Seal in an 8' long section to fit a 7' door (additional 1 ft. of weather seal included to allow for shrinkage and trimming). You can be assured that you are using the proper seal if your old seal looks like the P-bulb seal. The age of your Windsor garage door does not matter because Windsor has only ever made one size P shaped bottom seal and this product. Installing Windsor P-bulb is easy. Garage Door Supply Company recommends the installation to be done by one person to feel the seal and one to pull it through the channel. Please see our complete selection of Weather Seal products for doors of various sizes.