Hayward, Chlorinator/Feeder (VITON) Lid Replacement O-Ring (CLX200K) Fits: CL200/CL220
This Generic VITON o-ring offers perfect fit.  Why VITON? Chemical feeders introduce the harshest chemical your pool needs.  At it's strongest state (in the feeder) it is hard on o-rings!  VITON o-rings were made to LAST longer. SAVES YOU MONEY and time!