EPA Primer Bulb-5/16".I.D.:5/16" or 7.9mm.Bulb Type:Large Capacity.Sierra is a leading supplier of primer bulbs to the marine aftermarket.We use double check valves with viton balls and stainless steel springs.Both EPA/CARB certified.Utilizes Floroelastomer (FKM) material for traditional look and operation.7 1/2" or 190.5mm overall length including barbs.Meets current EPA regulations in effect 1/1/2011 of 15 g/m2/24 hrs