(3 Pack) 3M Aqua-Pure 63597174C ORing [Genuine Captain O-Ring Part]<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Includes 3 (three) 3M Aqua-Pure 63597174C O-Rings</li><li>Fits Housings: AP11S， AP11T， AP12S， AP12T， AP26T， AP51T， AP101S， AP101T， AP102S， AP102T， AP110， etc</li><li>Replace your O-Ring with every 3rd filter change to prevent leaks</li><li>O-Ring is approximately 3.5" Inside Diameter x 3.75" Outside Diameter</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31bBWgVy1uL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41brO5w5r%2BL.jpg" noproxy>