8mm HandOperated Primer Bulb — Manual Fuel Priming and Transfer Key benefits Rapid priming: Builtin non valve and simple pushandrelease action prime fuel lines quickly, restoring flow and reducing airlocks without tools or electricity. Reliable when you need it: Ideal for engines and systems that lack electronic selfpriming or for dualtank setups that require manual intervention. Durable construction: Long‑lasting rubber bulb with an aluminum alloy connector offers dependable performance during repeated use, filter changes, and cold starts. Secure fit and consistent flow: Designed for 8mm tubing connections to maintain steady fuel delivery and prevent backflow. What it does Manually primes fuel lines on cars, boats, and motorcycles using an 8mm handoperated bulb with a builtin oneway (non) valve. Transfers fuel or vegetable oil safely and steadily through secure 8mm tubing connections. Eliminates or reduces airlock problems so engines start more easily and fuel systems operate smoothly without external power. Specifications and materials Tubing size: 8mm connections Dimensions: approximately 150 mm length, 43 mm width Bulb material: durable rubber Connector: aluminum alloy Operating mechanism: pushandrelease with builtin non valve Practical use scenarios Fuel filter replacement on a car or motorcycle: Use the primer bulb to reestablish fuel flow after replacing the filter so the engine starts without repeated cranking. Outboard motor maintenance or startup: Manually prime the outboard fuel line when the boat's system will not selfprime, or when transferring fuel between tanks or containers. Field refueling or vegetable oil transfer: Move fuel or vegetable oil between containers or into a tank when pumps or electrical priming are unavailable. Why customers choose this product Simple, tool operation that works anywhere there's an 8mm fuel line Compact, portable size for onboard storage or a roadside tool kit Robust materials for repeated use during maintenance and emergency priming Includes 1 × 8mm handoperated primer bulb with rubber bulb and aluminum alloy connector (approx. 150 mm × 43 mm) Simple to use, reliable in the field, and compatible with a wide range of gas engines, cars, boats, and motorcycles where manual priming or fuel transfer is required.