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Pentair FNS Plus Tank Lid Assembly 36 sf | 170020 Shasta Exclusive making it a versatile choiceThe Pentair 170020 FNS Plus Tank Lid Assembly restores a secured seal so your 36 sq ft DE filter runs at full strength again. Specifically, this genuine Pentair replacement part fits as intended. Moreover, it locks down evenly, and protects internal components from air intrusion and water loss. What makes the Pentair 170020 Tank Lid Assembly the right replacement for my FNS Plus 36 sq ft filter? The Pentair 170020 is an exact OEM replacement designed