Hayward Micro-Clear SS Filter Tank O-Ring O-430 DEX360K<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>18-5/16" Inner Diameter</li><li>7/16" Cross Section</li></ul></div><img src="http://ecx.images-amazon.com/images/I/318vJDlXNzL.jpg" noproxy>