Take off the vent.
How to change a roof vent.
Plenty more videos t.
Slide a new roof jack sized to fit your vent pipe.
You can use a putty knife or other tool.
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If the vent is too worn out to simply seal you may have to climb onto the roof and carefully remove the vent.
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.
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.
To replace a damaged roof vent jack on your home.
Pry up the old jack and remove it by pulling it up over the vent pipe.
Remove any roofing nails and slide out the shingles.
On the roof carefully peel off any old sealant around your existing vent to access the mounting screws.
Carefully pry up the shingles around the roof jack using a flat pry bar.