Attwood Universal Primer Bulb， 5/16-Inch<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> 5/16” model </span></li><li><span class="a-list-item"> Exclusive three-layer construction prevents collapse under vacuum and ballooning/bursting under pressure </span></li><li><span class="a-list-item"> Exclusive high-efficiency check-valves for faster priming and low fuel restriction (less than 1kpa restriction at 50 liters/hour) </span></li><li><span class="a-list-item"> Engineered hose barbs and stainless steel steeples clamps for leak- free performance </span></li><li><span class="a-list-item"> Compatible with Ethanol blended fuels </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31Yht-YG6RL.jpg" noproxy>