Quote: I assume you installed just the cap and not the flange?
Hey Phil.. if you look closely at the reflections in the pics you can see threads on the backs of the flanges. I'm guessing the flange screws into the tank (and probably locks in somehow), then the cap into the flange. The "key" is the rectangular looking thing in the front (part 8311) that fits into the slots in the sides of the cap to open it.
I assume it'd screw over the top of the console...would love to see a pic of it on an tba/sm. If it didn't hang over the edges I think it'd look ok.
