These tanks designed by Paul Hopkins are designed to be used in the Aviation Design F-16 as extra onboard internal fuel capacity of 40oz. (Wedged shaped 4.125"long, 3.5" wide and 2.375" tall).The tanks fit along side the turbine in an opening that you need to cut in the turbine mounting plates. 

The tank comes fully assembled and pressure tested with standard 1/8" Jet Tech O-ring style fuel and vent fittings installed but does not include a clunk.  Clunks may be ordered separately on the "fuel fittings"  page.