Frost King's RV18 - 18 Ft. Vinyl Garage Door Bottom Replacement Seal. 2 3/4 in. is an essential garage door maintenance item. This item works similarly to window and door weather stripping for the garage and helps fill gaps and spaces to insulate and weatherize your garage. Garage door seals work much like the classic Frost King Door Sweeps and help to prevent dirt, dust, water, insects and debris from getting in to your garage. This heavy-duty black vinyl weather strip slides into most garage door bottom tracks for easy DIY installation.