Pentair 53108900 Spring Barrel Nut Assembly Replacement Pool/Spa Cartridge and D.E. Filter<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Spring barrel nut assembly replacement</li><li>Fits Pentair Clean &amp; Clear Plus pool and spa cartridge filters</li><li>Also fits Pentair FNS Plus pool and spa D.E. filters</li><li>Measures 2-inch length by 1-1/4-inch height by 1-1/4-inch width</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51m7k87po0L.jpg" noproxy>