Wolf Pup 16FQ Roof
Sounds like it's one of the plumbing vents / tank vents. I'm not sure which is which, gray tank/black tank, but as far as the vent caps, they're the same. This is a 16 FQ, looking front to back.
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2019 Wolf Pup 16FQ - bought new 3/2020
2013 F150 5.0 STX SCab 4x4 SB/3.55 rear/tow pkg./36 gal. tank/1695 Payload/7350 GVWR
Andersen Hitch
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