1. Frequently used as a hand pump in boats to supply fuel to the outboard motor. 2. To introduce fuel into the fuel pump after replacing the fuel filter. 3. To transfer gasoline, diesel, oil, water, etc. 4. Connects to most hose lengths. One-way function only. 5. Made of the best rubber and aluminum material, durable, oil-resistant, and aging-resistant. Specification: Description: This is a marine fuel line assembly. It is made of alcohol-resistant material. The complete fuel line assembly includes a 7-foot fuel line hose with a large primer bulb and fuel line connectors for both the tank and the engine. The primer bulb and rubber hose provide greater fuel flow to maximize performance. It is compounded to accommodate today's alcohol-enriched gasoline blends. It is also fully compatible with ethanol-blended fuels. Don't miss out! Features: Frequently used as a hand pump in boats to supply fuel to the outboard motor. For introducing fuel into the fuel pump after replacing the fuel