This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases Replacement rubber O-Ring gasket seal for Intex filter pump top covers. Measures approximately 6-1/2″ outside diameter Product Features Fits: Intex 56633 (Krystal Klear Model 633) Intex 56631 (Krystal Klear Model 51) Intex 56611 Combination filter pump and chlorine generator This post