Pentair Tank Lid, 48 sq. ft. Filter | FNS Plus | 170021 PWWB and remove

and remove

a damaged valve seat will compromise the new cone's seal and cause the same erratic movement you're trying to fix — address both at the same time to avoid repeat service calls

One-Step Application: Pour directly into skimmer - no mixing or measuring required

Note from Unicel: If your existing cartridge is labeled C-5303

Pentair Part Number 170016 Component Tank Bottom Assembly Pro Tip

Pentair Tank Lid, 48 sq. ft. Filter | FNS Plus | 170021 PWWB and removeThe Pentair Tank Lid, 48 sq. ft. Filter (170021) is the OEM replacement lid for the FNS Plus 48 sq ft D. E. filter model FNS PLUS 48. This is a direct factory matched replacement that restores the pressure retaining top closure of the filter tank to original specification. The tank lid forms the sealed top of the FNS Plus filter tank. A cracked, warped, or seal compromised lid allows system pressure to escape, reducing filtration efficiency and