Pentair R172212 Cartridge Housing Replacement Dynamic Series I Inline Pool and Spa Cartridge Filter<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Cartridge housing replacement</li><li>Fits Pentair Dynamic series I inline pool and spa cartridge filter models RDC-25， RDC-25S， RDC-50， RDC-50S</li><li>Measures 13-27/73-inch length by 13-27/73-inch height by 5-21/25-inch width</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31CYIWJMIZL.jpg" noproxy>