{"product_id":"pentairfnsplustanklidassembly36sf170020pen170020","title":"Pentair FNS Plus Tank Lid Assembly 36 sf | 170020","description":"\u003cdiv\u003e\n  \u003ch2\u003ePentair 170020 Tank Lid Assembly for FNS Plus 36 Sq Ft D.E. Filter (FNSP36)\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Pentair \u003cstrong\u003e170020\u003c\/strong\u003e is an OEM replacement \u003cstrong\u003etank lid assembly\u003c\/strong\u003e for the Pentair\/PacFab\n    \u003cstrong\u003eFNS Plus 36 sq ft\u003c\/strong\u003e vertical-grid D.E. filter (commonly referenced as \u003cstrong\u003eFNSP36\u003c\/strong\u003e \/ FNS Plus 36).\n    This is the upper tank half (lid\/top shell) that clamps to the tank bottom and seals with the tank clamp and tank O-ring.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Pentair \/ PacFab \u003cstrong\u003eFNS Plus 36 sq ft\u003c\/strong\u003e D.E. filter\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCommon model reference:\u003c\/strong\u003e \u003cstrong\u003eFNSP36\u003c\/strong\u003e (36 sq ft vertical-grid D.E. filter)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart type:\u003c\/strong\u003e Tank lid \/ upper tank half assembly\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\n    Always verify your filter model and parts diagram before ordering. FNS Plus lids differ by filter size (24, 36, 48, 60 sq ft).\n  \u003c\/p\u003e\n\n  \u003ch3\u003eWhat This Part Does\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eForms the upper half of the filter tank housing\u003c\/li\u003e\n    \u003cli\u003eProvides the clamping\/sealing surface for the tank O-ring and clamp band\u003c\/li\u003e\n    \u003cli\u003eHelps maintain a pressure-tight filter tank during normal operation\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhen to Replace the Tank Lid\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCracks, hairline fractures, or visible leaks from the upper tank shell\u003c\/li\u003e\n    \u003cli\u003eWarping or damage that prevents a proper seal with the tank O-ring\u003c\/li\u003e\n    \u003cli\u003eDamage at the clamp contact area from age, overtightening, impact, or UV exposure\u003c\/li\u003e\n    \u003cli\u003ePersistent leaks after replacing the tank O-ring and confirming clean sealing surfaces\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTurn off the pump and \u003cstrong\u003erelieve all filter pressure\u003c\/strong\u003e before opening the filter.\u003c\/li\u003e\n    \u003cli\u003eInspect and replace the \u003cstrong\u003etank O-ring\u003c\/strong\u003e if it is flattened, cracked, swollen, or nicked.\u003c\/li\u003e\n    \u003cli\u003eClean all sealing surfaces thoroughly before reassembly.\u003c\/li\u003e\n    \u003cli\u003eReinstall the clamp band evenly and follow manufacturer tightening procedure (do not over-tighten).\u003c\/li\u003e\n    \u003cli\u003eAfter restart, check for seepage once the system reaches full operating pressure.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products (Aqua Pool Supply)\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=Pentair%20170020\"\u003ePentair 170020 Tank Lid (Search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=Pentair%2039010200%20tank%20o-ring\"\u003eFNS Plus Tank Clamp O-Ring 39010200 (Search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=Pentair%20190003%20clamp%20kit\"\u003eFNS Plus Clamp Kit 190003 (Search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=Pentair%2059023500%20FNS%20Plus%2036%20grid\"\u003eFNS Plus 36 Grid Assembly 59023500 (Search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=Pentair%20192019%20drain%20plug%20wrench\"\u003ePentair 192019 Drain Plug Wrench (Search)\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eKeep the tank O-ring clean and lightly lubricated with pool-safe silicone lubricant to reduce pinching and leaks.\u003c\/li\u003e\n    \u003cli\u003eNever open the filter until the pressure gauge reads zero and air has been fully relieved.\u003c\/li\u003e\n    \u003cli\u003eIf the filter is exposed to direct sun, shade can help extend the life of plastic tank components.\u003c\/li\u003e\n    \u003cli\u003eRecord your clean starting pressure after service so you can track when the filter needs cleaning.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":46797892255919,"sku":"170020","price":239.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/pentair-fns-plus-tank-lid-assembly-36-sf-170020-pool-filter-parts-7283169.jpg?v=1777068882","url":"https:\/\/freshized.com\/products\/pentairfnsplustanklidassembly36sf170020pen170020","provider":"Freshized","version":"1.0","type":"link"}