Pleatco PRB50-IN Spa Pool Filter， 1 Cartridge<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Replacement filter for pool and spa cleaning systems</li><li>50% open ABS free flow cores maximize water flow through REEMAY filter media</li><li>Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span</li><li>13-5/16-by-5 inches (length x diameter)， openings 2-1/8 inches</li><li>Dynamic Series IV - DFM， DFML， Series II &amp; III RTL/RCF-50， Series I RDC-50， RDC-50S， Waterway， Custom Molded</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31potHENmmL.jpg" noproxy>