Sierra 16-368-0566 Shields Low Permeation Marine Fuel Hose 516 x 50 Sierra Shields Low Permeation Marine Fuel Hose has a plastic barrier veneer with an NBR outer layer tube to prevent permeation. This polyester reinforced hose complies with EPA and CARB very low permeation requirements and is weatherUV resistant. This hose is primarily used for fuel feed gasoline up to 85 ethanol blended fuelsdieselall bio-diesel blends. Features Meets USCG Type A1-15 requirements for pleasure boats Meets SAEJ15