2) Unicel C-4625 Rainbow Pentair In-Line Replacement Spa Filter Cartridges C4625<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>25 Sq Ft</li><li>Length: 13-15/16"</li><li>Outside Diameter: 4-15/16"</li><li>Top Hole: 2-1/8" Open</li><li>Bottom Hole: 2-1/8" Open</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Q69Ne2naL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41rob5BL-JL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41VGbir4mmL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51jZvq2FJ1L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51CMeY4sbgL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41iWNrOAthL.jpg" noproxy>