Response to Hello Vicki.  The Custom Molded Products Air Relief  Assembly part number 4655-03D is NOT compatible with the Pentair Nautilus DE Filter but IS compatible with the Pentair FNS Plus DE Filter.  Please verify the Pentair DE Filter model prior to ordering a replacement air relief assembly.  Attached please find the air relief assembly;y part number for the Pentair Nautilus FNS DE Filter.  Air Relief Assembly - 273550

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