Shields Silverado 4000 Fuel Line is the best B1 fuel line on the market. This outstanding hose utilizes a complex construction technique involving a THV500 barrier layer, a Nitrile jacket, polyester reinforcement, and a CPE cover. The Silverado 4000 Hose has a small outside diameter and is extremely flexible and easy to clamp. The Silverado 4000 meets SAE J1527 Type B1-15 and ISO 8469 B1 requirements. Silverado 4000 Outboard Fuel Line is resistant to ethanol blended fuels. This hose is EPA and CARB compliant. Features a THV barrier layer to prevent permeation, polyester reinforcement for strength, and a weather and UV-resistant CPE cover. The gray color keeps the hose cooler and helps prevent vapor lock. Silverado 4000 Hose is for above deck primer bulb applications. Not fire retardant. • Meets EPA low permeation requirements• 2-Year Emission Performance Warranty• For above deck primer bulb applications• Not fire retardant• Inner Diameter: 3/8"• Outer Diameter: 35/64"• Length: 25'• Sierra Part No. 16-337-0385 Extremely flexible and easy to clamp 3/8" I.D. 25' long Sierra Part No. 16-337-0385 | Shields Silverado 4000 Outboard Fuel Line, 3/8"ID, 25', Part 16-337-0385 in Grey