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The Pentair Sta-Rite System 3 Bulkhead O-Ring - Large (35505-1428) is a direct Bulkhead O-Ring Replacement. This is the larger of the two outer bulkhead O-Rings (Sold Separately). Fits the Pentair Sta-Rite models S7M120, S7M400, S8M150, S8M500, S7D75, S8D110, S8S70, S7S50, PTM50, PTM70, and PTM100.