Hayward CX250Z7 O-Ring Lock Knob<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>O-ring replacement</li><li>O-ring for Hayward Star-Clear and Star-Clear II Locking Knobs</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41UHtefHo9L.jpg" noproxy>