What it does: 8mm primer bulb with a builtin non valve that quickly primes fuel lines and prevents backflow during maintenance or filter replacement. Key benefit: restores immediate fuel flow so engines start reliably after service or after air has entered the fuel system, eliminating the need for electric priming. Compatibility: designed for use with gasoline engines and fuel systems on cars, motorcycles, boats and outboard engines and systems. How it solves problems: Removes air from fuel lines fast by simple handsqueezing, preventing hard starting and stalling after repairs or fuel filter changes. Non valve maintains prime and prevents fuel loss or siphoning when the engine is off. Compact size fits tight installations and generalfit fuel lines where an 8mm primer is required. Construction and durability: made from rubber and aluminum alloy for wear resistance and reliable performance in both marine and automotive environments. Size and form factor: compact 150 mm long x 43 mm wide bulb that fits common installations without adding bulk. Simple operation: squeeze the bulb to create suction and push fuel through the line; repeat until steady fuel flow is achieved. Practical use scenarios: 1. Bleeding air and repriming fuel lines after replacing a fuel filter on a car. 2. Manually priming an outboard engine before starting on a boat when there is no electric prime system. 3. Restoring fuel flow on a motorcycle after running the tank dry or performing carburetor service. Why choose this unit: straightforward, reliable manual priming with a non valve and durable materials—designed to work with 8mm fuel lines across automotive and marine applications without requiring electrical components.