Guardian 2 Pack Filter Fits-Pleatco: PFF25P4， Unicel: 4CH-22，Filbur: FC-2399 free flo spas<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>4ch-22</li><li>diameter 4 5/8''</li><li>length 6 5/8''</li><li>1 1/2'' MPT， Fine Pipe threaded</li><li>19 sq ft.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/511EpJybq1L.jpg" noproxy>