Pentair 57007300 Commander Pool Filter Lid O-Ring
<div style="text-align: left;"><strong>[Product Information]</strong><br>
<ul>
<li>Inside Diameter: 8-1/16"</li>
<li>Outside Diameter: 8-11/16"</li>
<li>Cord Thickness: 5/16"</li>
</ul>
</div>
<img src="http://ecx.images-amazon.com/images/I/11n8Tw6QjrL.jpg" noproxy>