Marvin Double Hung Window Meeting Rail Weather Strip

Dual Sweep, Marvin Double Hung Meeting Rail Weather Strip | 84" Lengths, MV-116, Dual Seal Sweep Style (as Shown) Weather Strip, Meeting Rail - This Home Owner MINIMUM ORDER PACK CONSISTS OF FIVE (5) PIECES @ 84" Long.  

The meeting‑rail weatherstrip on a double‑hung window exists for one essential reason: to seal the joint where the upper and lower sashes meet, which is the single biggest air‑leak point in the entire window. It blocks drafts, moisture, dust, noise, and rattling at the center seam of the window by creating a tight, controlled seal when the sashes close together. This improves energy efficiency, comfort, and window stability.