Pentair 194997 Machined Nut Replacement Pool and Spa Filter<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Nut replacement</li><li>Fits Pentair FNS pool and spa D.E. filters</li><li>Also fits Pentair Quad pool and spa D.E. filters</li></ul></div><img src="http://ecx.images-amazon.com/images/I/2123avd4XwL.jpg" noproxy>