The fittings on the Summit fuel cell are huge. You'll have to Study the AN type fittings in the summit catalog to adapt to your needs. It has 2 fuel ports at the bottom(8AN male), you can block one off if you don't use a circulating type system.
Not sure on the venting but it has 2 ports on top(6AN male), one with a rollover valve. I think I would block the open fitting and use the rollover valve equipped fitting for a vent to a charcoal cannister or however your system is normally vented.
