This makes cutting a hole real easy but u could easily mount it inside if u wanted.
On my auto sleeper amethyst I cut a hole in the body below the floor line using an adjustable wood circle drill thing. This means any water leak is irrelevant.
Similar to this

When I removed the system, I filled te gap using a circular vent used on houses, fitted perfect and available from most DIY stores

If u want to fit on exterior, make sure u buy the 1.5m filler hose otherwise u will be in trouble.
Also, I'm familiar with the legends, any questions just take a picture and ask.





