BiltBest Window Weatherstrip for Double Hung Windows,  - Meeting Rail / Bulb Weatherstrip

Double Hung and Some Other Single Hung Models and Brands - Meeting Rail Bulb Weatherstrip - OEM window part - Window Sash Stile and Frame Special Purpose Bulb Seal Weatherstripping.  #RF-33 for Bilt-Best Double Hung Windows. Primary use at "meeting rail" component stiles. This OEM Style Weatherstrip is made specifcally to seal air leaks between the rails. PLEASE NOTE: if your Biltbest Windows and Doors are 7+ Years of age, then you should consider replacement of weather strips and seals. Cold, heat and ultra-violet light affect the effectiveness and breakdown of this type of seal. Remember, it's not how they "look" .. it's how they function - and most homeowners do not understand what is referred to as "built-in memory" ( see RFQ'S ) .