18 in. Grid Bottom Manifold 36 sq. ft. Filter FG-1236 FC-9230
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Bottom Manifold 36 sq. ft. Filter 18 in. Grid FG-1236 FC-9230 Replacement for 36 sq. ft. filters: Purex Premier Pentair SM/SMBW 2000 Series Pentair SM/SMBW 4000 Series Purex Atlas Collar has single notch, 10-3/4″ wide. Click here if you want to buy a complete set of grids.