Quote:
Originally posted by stgla
The flange is the "lip" or flat disc-shaped piece that sits flush with inside of your tank wall and the gasket is the flat rubber ring that sits against the tank wall from the outside. (Someone please correct me if I have that wrong)
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The gasket needs to be in-between the flange & the glass.
The bulkhead can be installed either way, With the flange inside or outside of the tank! Just be sure the gasket is in-between the glass & the flange.