Pool Ruler R172009 Chlorine Resistant VITON O-Ring 2 Pack + Lubricant for Pentair Rainbow Chlorinator 300 &amp; 320 Lid<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>CHLORINE RESISTANT VITON: Our R172009 o-ring is manufactured with Viton (FKM) which is resistant to chlorine， meaning a long lasting seal for your Pentair Chlorinator</li><li>FREE LUBRICANT: 1cc tube of Pool Ruler Synthetic Grease with Teflon (PTFE) included. This lubricant is safe for use on o-rings and your pool.</li><li>TWO PACK: Use one now， keep the other as a spare.</li><li>FULL SEASON GUARANTEE: This 2 Pack will last you the whole season， if not， we will refund or replace the kit， your choice.</li><li>POOL RULER AUTHORIZED SELLER: WestWorks is the ONLY authorized seller of Pool Ruler brand o-rings， if you see this from another seller it does not have a guarantee， and is likely a non-Viton imitation.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51fr4Zoy11L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31jkQlFpgCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41xLjr6vkVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41D2d45zV-L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41gXo4llhXL.jpg" noproxy>