Mallory 9-38101 (3/8") CARB Compliant Primer Bulb Single-piece check valve that increases pumping efficiency 20 percent over the leading OEM product and prevents the bulb from kinking Requires 50 percent less force to compress at low temperature Outstanding durability - made of a proprietary compound that resists harsh heat, cold and sunlight Exceeds current EPA/CARB Fuel Permeation standards by almost 70 percent 2 Year Parts and Labor Warranty