The SPD AN hose range covers the use of most media such as gasoline, methanol, ethanol (E85 / E100), diesel, oil, cooling water, servo fluid and brake fluid. You choose hose depenging on application. AN hose is a collective name for the different hoses available. PTFE AN-hose is the choice for ethanol and methanol use. AN hose with rubber core can handel all other media. Steel or nylon cover is mostley for looks even if the black nylon covered hose is lighter due to only one layer of steel braid.