ID: 1/4″. OD: 7/16″. Length: 50′. Utilizing a complex construction technique involving a THV500 barrier layer, a Nitrile jacket, polyester reinforcement and a CPE cover. Has a small OD, is extremely flexible and easy to clamp. Resistant to ethanol blended fuels. This hose is EPA and CARB compliant. The gray color keeps hose cooler and help prevent vapor lock. For above deck primer bulb applications and is not fire retardant.