Attwood's multi-layer Primer Bulb provides the absolute best combination of performance, reliability, safety and compliance to ensure a safer, more enjoyable experience on the water. The patent-pending multi-layer Primer Bulb provides up to 60% more priming output than leading competitors in extreme conditions, while also exceeding new EPA requirements to prevent fuel evaporation. The exclusive 3-layer design ensures high output in temperatures ranging from 18 degreesF to 122 degreesF-plus resists collapsing and hardening. And inner expansion ring ensures the Primer Bulb won't collapse during engine operation. Dual high-efficiency check valves prime in any orientation with low-restriction fuel flow that ensures proper engine operation. All Attwood portable fuel components are designed to exceed OEM engine fuel flow requirements. OEM quality and performance at a fraction of the price Low permeation Primer Bulb prevents fuel evaporation, saving you gas and money Exclusive 3-layer construction provides the best spring-back during priming 60% more output per pump than leading competitor bulbs Premium materials provide optimal performance and reliability with no cracking/hardening over time Excellent priming in extreme cold and hot environments Zero chance of material delamination as seen by some competitor's products High-performance check valve O-rings provide 30% improved priming while keeping optimized flow during engine use (20 to 35% better than spring-loaded designs) 18 degreesF-122 degreesF operating temperature 3/8 inch inside diameter for use with appropriate sized hoses Compatible with Ethanol-blended fuels Compatible with all OEM brand engines (1hp-350hp) EPA and CARB-certified Designed to exceed OEM engine fuel flow requirements Order today!