gasket placement for overflow box with back

[gregzz4]

My through-glass overflow box uses 1 gasket inside the tank and 1 outside the tank, and both go between the plastic and glass. Any water that may leak past the threads just travels past the gaskets into the box.
And the lock nut is inside the outer box.

Not mine, but same idea
https://i0.wp.com/synergyreef.com/wp...fit=1000%2C442