Yes I have those also. I think they are called cyclone vent or something like that. They spin with the wind direction while drawing out the sewer gases.
I did not have any issues screwing them on however I caulked the trim rings into place.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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