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

An image is worth 1,000 words! Add an image or two to your comment to help ensure it is understood accurately.

Yes, please email me exclusive discounts, swimming pool tips and helpful how to guides. This comment may be posted on a public site. Do not include: HTML, references to other retailers, pricing, personal information, or any profane, inflammatory language.