Response to Hello Phong.  Attached please find the PureLine Prime Pump - PL26 Series exploded parts diagram.  A failing PureLine Prime Seal Assembly - PL2655 would result in a water leak between the Seal Plate and Motor Mounting Plate.   A shaft seal failure is a common pool pump issue.  Attached is a brief tutorial How To Replace a Pool Motor Shaft Seal.  Concurrent with the shaft seal replacement the Housing Gasket and Diffuser Gasket should be replaced.

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