Water leaking from top cap of air relief assembly - Nautilus NS48 (Pac-Fab, Pentair) DE filter

[Rob LBoston]

Hello - I just joined TFP today and am excited to get some advice from people that truly know what they are talking about.

I have a Nautilus NS48 (Pac-Fab, Pentair) filter. The filter is 20 years old or so, but it has worked well. I took the top cap off and inspected it, but didn't find a way to stop the leak. I am now planning to replace the entire air relief assembly (part no 27-3581 according to the Nautilus DE Filter Installation, Operation & Service manual). Can anyone tell me if they have come across this problem before, and if replacing the air relief assembly will fix the problem? See photo below. Thank you

 

[jgofnj]

The same exact thing happen to my Hayward DE Filter. I replaced the entire air relief assembly as you plan to do and yes, it totally stopped the leak 100%. Good as new now.

 

[Rob LBoston]

Thank you for your reply. Most helpful.