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711-4010 heater gasket
5 MarReplacing the heater union gasket is the first step in repairing your spa heater leak. It might also be the “split nut” but try the heater union gasket first. This waterwayparts.com union gasket measures an outside diameter of 2 7/8″.
We also carry a slightly “thicker” gasket 711-4020. Same size diameter but thicker material.