Hayward CX900W Star-Clear Plus Cartridge Filter Washer for Locking Knob<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Star-clear plus knob washer</li><li>Fits Star Clear Plus series cartridge filter</li><li>Weighs 1.0 pounds</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31A4ELH3CBL.jpg" noproxy>