Types of Weather Stripping | DIY Weather Stripping | This Old House - Bulb type weather strip
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Hollow Core Gray Vinyl Bulb Weatherstrip, T-Slot Slide in bulb weather-stripping used on windows and doors. Color: Gray Bulb Diameter: 1/4" Backing Width. This works great to retrofit my older () windows. It replaces worn out bottom sash weather stripping and we made it work for the upper sash as well.