The metal strip is from inside the rubber gasket. It is what attaches/grips the gasket to the frame of the opening. The top gasket on my kitchen slide failed and that strip rusted from the water intrusion. Newmar or your dealer sells it for about $5.00/foot but actually installing is is HARD (due to lack of clearance) and after trying for 4 hours to attach mine, I buckled and took it to the dealer to replace. It is easy if you can get your fingers in to push strain down on the frame. You want to replace it for both water/moisture and bug intrusion protection. Best of luck.
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