Attwood portable fuel tanks are constructed of the same high strength multi-layer co-extruded HDPE/EVOH material as found in automotive fuel systems. Attwood 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. Attwood's exclusive high-flow fuel cap exceeds OEM requirements and reduces wear on fuel pumps improving engine performance and life. Attwood portable fuel tanks are designed for use in all marine and non-marine small engine applications and will provide years of leak-free performance.