Pentair 192323 O-Ring Replacement Pool/Spa D.E. Filter and Pump<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>O-Ring replacement</li><li>Fits Pentair FNS， Nautilus and Nautilus Plus pool and spa D.E. filter models NSP36， NSP48， NSP60， NSP72</li><li>Also fits Pentair Bermuda skimmers and Hydropump pool/spa pumps</li><li>Circumference is 2.25 in. and thickness= 1.5cm.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31ZCNalDOVL.jpg" noproxy>