The EPA/CARB Compliant Primer Bulb with 1/4" Hose Barbs is designed to help improve engine performance. Comprised of gasoline and solvent-resistant construction, stainless steel clamps and dual internal check valves ensures a more rapid prime while preventing fuel flow back. Passes all 2011 Emission Standards implemented by both the EPA and CARB. Dual internal check valves Passes all 2011 Emission Standards | Moeller EPA/CARB Compliant Primer Bulb, 1/4" Hose Barbs