The 32 oz. Dubro tank fits pretty well. Back of the tank sits against the spar and the front against the aft end of the cockpit area. A quarter inch shim/bracket above the tank makes for a snug fit for the hatch below. A lug on either side of the hatch will keep it from moving from side to side. The passages down the sides of the tank are greater than the minimum 60mmm diameter area that Gaspar recommends for the X45.
