Hayward DEX2420Z8A DE and Cartridge Filters Manual Air Relief Valve Oring Kit<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Fits Pro-Grid DE， SwimClear and Swim clear cartridge filters</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31aEZKWdF8L.jpg" noproxy>