System:3 Air Relief Adapter Bushing filter-length_25 1/4 inches It has an overall size

It has an overall size of 6 x 6 inches which will fit over standard ceramic pool depth marker tiles

(Last number is 6 or 9

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System:3 Air Relief Adapter Bushing filter-length_25 1/4 inches It has an overall sizeThis is a Pentair Air Relief Adapter Bushing for the Sta Rite System: 3 Modular SMD Series D. E. Filters, SD Series D. E. Filters, and SM Series Modular Media Filters.