ADVANTAGES: I have an old screened sliding door and the gap at the bottom is smaller than the gap at the top. The valve was wide enough to close the space from top to bottom. I was concerned that the rubber would rub against the glass door, but the material is very light and flexible so this doesn't happen. However, it is important to trim the top and bottom carefully, otherwise it will stretch and interfere with the opening and closing of the screen door. CONS (for me): While this fits perfectly in the duct, the ends tend to pull out when the door is swept. This may be related to my door as it is old and the duct may be a bit distorted at the ends. I think a silicone swab will help. In addition, there is still a gap at the top, and since the channel is wider there, the gasket falls out. I can try silicone.
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