By Pentair Pool Products



Part # 4600-0021

Manufacturer Code 170021

Dimensions 19.5" H

Alternate Part #'s 170021, S170021, 14-110-1564, PEN170021

Product Description

Replacement Lid for the Pentair FNS Plus 48 DE Filter (170021)


?     Asked on 2/9/2016by Bill Ware

Does 170021 work with all FNS 48 bottoms?

A  Answered on 2/10/2016 by InyoPools Product Specialist Megan C.

Hello, Bill. The Filter Tank Lid, Fns Plus 48 Sq Ft (170021) is only designed to fit the Pentair FNS Plus DE Filter Tank Bottom Assembly 48 SQ FT (170017). Click here to view other parts available.

?     Asked on 5/20/2016by Ric

Is this a direct replacement for the PacFab 190029 top?

A  Answered on 5/21/2016 by InyoPools Product Specialist Patrick P.

Hi Ric, this is the direct replacement for the older style FNS plus lids, we would just need to know if you have the 48 Sq. Ft model or 60 Sq. Ft. if you have the 48 Sq. Ft. then this lid would be the direct replacement and if you have the 60 sq. ft. then you would require the 60 Sq. Ft. FNS Plus Lid You should be able to find this information on the label on the side of your filter.

?     Asked on 4/27/2020by Kevin Krietenstein

Will this replacement lid fit my Purex Triton Nautilus FNS 48 filter purchased in 1997?

A  Answered on 4/27/2020 by InyoPools Product Specialist Patrick P.

Hi Kevin, No this lid does not work on the Purex Triton Nautilus FNS 48 and unfortunately, that lid has been discontinued without a replacement. If your lid needs to be replaced then it may be time for a new filter like one of these DE Filters


Est. Repair Time

Less than 1 hr

Tools Needed


1     0

Lid was cracked due to recent freeze.

Written on 4/12/2021 by Guest

Removed metal ring from lid, replaced with new.

Were these instructions helpful? 


Review Summary

 (Average 4.67  out of 5 stars)
3 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Recent Reviews