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The Pentair Sta-Rite System 3 300 & 400 Tank O-Ring 21" (24850-0008) is an authentic Pentair Tank O-Ring Replacement. The Tank O-Ring fits Sta-Rite System 3 Pool and Spa Cartridge Filter Models including S7M120, S7M400, S8M150, S8M500, S7D75, S8D110.
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