Hayward Filter， Swim Clear， Generic Bulkhead Replacement O-Ring. Same as: SX220Z2<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Fits Max-flo II pump series SP2700X models SP2705X7(EE)， SP2707X10/2， SP2710X15/2， SP2715X20/2</li><li>Also fits Hayward Pro-grid Vertical Grid D.E and swimclear cartridge filter series models DE7220， C5030， C3025</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41p7bl%2BSebL.jpg" noproxy>