BiltBest Window Parts Casement Frame Sill Horizontal Weather Strip - Special Casement, Awning, Double Hung Sash Rails, Single Hung Frame Type Foam Filled Bulb Weatherstripping. This OEM Style Bilt-Best Casement Frame Sill Weatherstrip, Horizontal  #RF30,  is a "foam filled" , closed cell type weatherstrip made specifcally to seal air leaks around the movable window sash components. 

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