Replacement Hayward CLX200K Pool Chlorinator Lid O-Ring for CL200/CL220 with Lube 5-1/2-inch diameter O-ring for Hayward CL200 and CL220 chlorine feeder lid Seals cap to feeder body preventing chlorine gas leaks Chemical resistant Made in USA Includes 3 grams packet of PTFE based lubricant for easy installation Hayward In-Line Chlorinator Hayward Off-Line Chlorinator CL200 &amp; CL220