If the vent is too worn out to simply seal you may have to climb onto the roof and carefully remove the vent.
How to change a roof vent.
Slide a new roof jack sized to fit your vent pipe.
Take off the vent.
Carefully pry up the shingles around the roof jack using a flat pry bar.
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Make sure not to damage them in the process.
Pry up the old jack and remove it by pulling it up over the vent pipe.
This isn t normally the kind of video i put out but i got bored changing the vents in my camper so i filmed the last one and made a how to video.
On the roof carefully peel off any old sealant around your existing vent to access the mounting screws.
If you have a powered unit with wires make sure your camper power is off and clip the wires leaving sufficient wire length behind to make new connections.
To replace a damaged roof vent jack on your home.
Plenty more videos t.
You can then unscrew and remove the old vent.