"Designed to meet fuel hose specifications of SAEJ1527 Dec 85, USCG and NMMA. Formulated to handle gasoline, diesel and alcohol blended fuels. " "A-1 hoses are designed for feed lines where the fuel is normally continuously in the hose. A-2 hoses are designed for vent applications where the fuel is not normally continuously in the hose. " Both A-1 and A-2 hose have flame resistant covers for enclosed engine compartment applications.