If you're talking about the seal where the entire window is installed that's butyl tape that can be found at any rv supply store & most hardware stores. Its like silly putty in a roll.
IIRC Kinro (which Lippert owns) manufactures most of the Windows now, you could check with them to see if they supplied yours.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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