Pool Ruler CLX200K O-Ring (Chlorine Resistant VITON) + LUBRICANT for Hayward CL200 & CL220 Pool Chlorinator Chemical Feeder Lid CHLORINE RESISTANT VITON: Our CLX200K o-ring is manufactured with Viton (FKM) which is resistant to chlorine, meaning a long lasting seal for your Hayward Chlorinator 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. ONE YEAR GUARANTEE: We will return or replace your o-ring if it does not last you for a full year if taken care of properly. EXACT FIT: Designed to OEM standards, our CLX200K o-ring is an exact fit for your CL200 or CL220 chlorinator. 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.