Pentair FNS Plus Tank Lid Assembly 36 sf | 170020Product OverviewThe Pentair 170020 FNS Plus Tank Lid Assembly is a genuine OEM replacement upper tank section for the Pentair FNS Plus 36 sq ft D. E. filter. This lid assembly forms the top half of the filter tank and provides the upper sealing surface needed for proper clamp band and tank O ring fitment. This replacement part is commonly used when the original tank lid is cracked, leaking, damaged, or no longer sealing correctly. It is designed to

or an electrode that no longer responds well to cleaning after calcium buildup

A: Professional installation is strongly recommended because suction outlet components are safety-critical

and Purex nichesCustomers replacing an existing Amerlite fixturePools requiring a 120V

eliminating the need to daisy-chain multiple cells in many installations

Designed for pressurized pool filter applications

and wall preparation are important for achieving a smooth and even waterfall sheet

Supports Reliable Operation – replacing worn or missing parts helps maintain chemical feed accuracy

Q: Does this include the basket

A: Yes—this is the OEM ORP probe designed specifically for the Pentair IntelliChem controller

wiring layout

Aladdin replacement part commonly used as an aftermarket basket option

Service-Friendly Design: Built for easier cartridge access and maintenance when compared with more complicated filtration systems