Enjoy the superior performance of Dynamic Rubber garage door bottom weather seals from North Shore Commercial Door. The garage door bottom inflatable bladder seal works like a tire. It's pumped full of air until it's pressurized and then capped. This inflatable garage door seal is installed by placing the inner tube inside your existing seal. Once the inflatable door seal is inflated, it will seal gaps and void between your garage's concrete floor and the bottom of your garage door. This seal will fit safely inside seals that are 3 1/4 inches or more. See our online how-to video for a demonstration on how to install this premium inflatable garage door bottom weather seal. Or, contact our friendly, knowledgeable staff. This kit includes air seal, nylon ball with string attached.