Attwood 12 Gallon Fuel Tank Attwood Portable Fuel Tanks are constructed of the same high strength Multi-layer Co-extruded HDPEEVOH material as found in automotive fuel systems. Attood portable fuel tanks are certified to EPA and CARB standards and include an exclusive ratcheting, automatic low-restriction, high-flow fuel cap that ensures proper fuel flow and engine performance in all conditions. Attwoods exclusive high-flow fuel cap exceeds OEM requirements and reduces wear on fuel pumps improvi