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Do a search for mushroom vent or mushroom attic vent and there will be lots of posts. They get very brittle and break easily from UV.
My previous Montana I couldn't find them so I took 6 inch PVC cap, cut it down like the original, drilled a hole in the center and mounted it. It was still in good shape when I traded that camper in.
Now you can find them on the web, some just the cap, some the whole vent, but all you really need is a new cap.
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