In my last rig I replaced mine with a Fantastic Fan. It came with butyl tape, and a gasket, all I had to do was supply the Dicor, which you need to inspect and either add some to the old, or scrape it and replace it. Seals around vents are not permanent so I would not worry to much about breaking a seal that will eventually break on it's own.
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2007 Fleetwood Excursion 40E
2007 Chev Classic CC LB D/A - Toad
2013 Jeep Sahara Unlimited - Backup Toad
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