Just a quick work session to install the bulkhead-style fittings through the inboard ribs of both fuel tanks that are used for the vent lines. These fittings must be installed with tank sealant, but I also applied some more sealant on top of the nut after it was torqued down. I also took a Scotch-Brite pad to roughen up the mating surfaces where the bulkhead will be installed, since that will soon be important. What's next? I think it's finally time to seal up the tanks with the final side.