Response to For your DE Filter model # 011553, the parts breakdown page maybe be viewed here The replacement grids is key # 8. If you have the 24 Sq. Ft. unit, then the girds would be 12 inches in length and the replacement grid part # is 4677-15, which may be viewed here Please be sure that you have the 24 Sq. Ft unit or that your grids are 12 inches in length.

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