Moto Iron 2.1 Gallon Narrow Sportster Frisco-style Fuel Tank2. 1 Gallon Narrow Sportster Frisco style Fuel Tank Looking for a gas tank that works visually with a wide range of choppers and customs? A derivative of the classic peanut tank is always a safe bet. 2. 1 gallon capacity Pressure tested Accepts bayonet style (cam lock) fuel cap; not included "Frisco" filler located high to use full capacity of tank Left side filler is female 1 4 NPT to accept many popular petcocks Low tunnel design so the tank sits