Response to Hello Del.  The Plug with O-Ring 1 1/2" - SPX1022C will fit the Hayward Micro Clear DE Filter DE-2400-Z-10.   Plug w/ O-ring 1-1/2" - SPX1022C   Attached please find an exploded parts diagram for the Hayward  Micro Clear DE Filter.  Please note item Key 23.  Hayward Micro Clear D.E.

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