Response to Hi Paul, No this air relief assembly does not work on the Sta-Rite System 3 S7M120. However, we do carry the Air Relief Assembly for the Sta-Rite System 3. You can view or purchase the S7M120 Air Relief Assembly or individual parts for the S7M120 Air Relief Assembly through this link Sta-Rite System 3 S7M120 Parts Page (Assembly is key 25)

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