I would replace it (or completely rebuild what's left of it)...
From your photos, the insect screen is broken and much of it is missing. Just replacing the cap would be a "great avenue" for mice, roaches, flies, wasps and any other "critter that wants a warm place to nest"....
They do sell "just the caps" but on yours, the center threaded section that secures the cap is no longer "part of the mix"...
Also, in the current condition, it's a "funnel to channel rainwater into the insulation in the ceiling"... Until you do get it repaired, use some tape and "weatherproof what's left up there"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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