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Yes it is outside under the back window. Looks like plastic or some sort of padding?Is that outside, under the back window? Is that one of the vents for the pressurization of the cab? If it is, you don't want water getting into the cab from there. It's hard to tell with that pic.
Ok so any possible way to fix that?Yes there should be 2 of them, one on each side, they are vents, so that when you close your doors the air inside can escape out there, they are on all F150’s. It should be flush with the back of the cab.
There is some sort of a cover/liner that is like 1/8” thick that is almost same height as the bed.
Yeah, idk what that is. Did you buy the truck new?There is some sort of a cover/liner that is like 1/8” thick that is almost same height as the bed.