Generic Full Filter Grid Element for Nautilus/FNS and MicroClear Filters - 48 Square Feet filter-length_18 7/16 inches This is a PVC Reducer

This is a PVC Reducer Bushing with Spigot x FIPT fitting connections that measure 5 x 4 Inches

Easy to install and intuitive to operate

irregularly shaped joints

5 inch wide plastic recessed in-wall step

Generic Full Filter Grid Element for Nautilus/FNS and MicroClear Filters - 48 Square Feet filter-length_18 7/16 inches This is a PVC ReducerThis is a Generic Full Filter Grid Element replacement for 48 square foot FNS Nautilus and ProGrid MicroClear D. E. filter grid elements. This is a full grid assembly measuring 24 inches. This filter element is used in the ProGrid DE4820, MicroClear DE4800, and MicroClear DE 480S Stainless Steel filters. It is also used in Pentair FNS48 Pool and Spa D. E. Filters, Nautilus NS48 and Nautilus Plus NSP48 Pool and Spa D. E. Filters. Also fits Zodiac DEV48