The Attwood Fuel Hose Barb 1/4" MPT x 5/16" Hose fitting ensures a reliable and leak-resistant connection for your fuel system. Featuring a durable brass construction, it is compatible with leaded, unleaded, ethanol-blended, and alcohol-blended fuels. Its 1/4" male NPT thread and 5/16" male barb provide a secure fit, making it ideal for marine and automotive fuel lines requiring expert-grade performance.