Holley 125-500 Power Valve Check Ball Kit<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Includes spring， brass seat， and check ball</li><li>Protects power valve from backfire damage</li><li>Also includes proper drill bit size with stop</li><li>Easy to install</li><li>Detailed instructions are included</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41kyWJGcOqL.jpg" noproxy>