Attwood's Universal Primer Bulbs are designed to provide up to 60% more priming output than the competition while exceeding EPA and CARB requirements for fuel evaporation. Our exclusive three-layer design resists collapsing and hardening and ensures high output in temperatures ranging from 18°F to 122° F. Low-permeation material prevents evaporation. Includes dual high-efficiency check valves. 2-year warranty.