{"product_id":"pentair-178581-lid-assembly-clean-clr-420sqft-fns-plus","title":"Pentair 178581 Clean \u0026 Clear 420 Sq Ft Filter Lid Assembly","description":"\u003cp\u003e\u003cstrong\u003eWhat This Part Is Used For\u003c\/strong\u003e\u003cbr\u003ePentair 178581 Lid Assembly - Clean\/Clr, 420Sqft, FNS Plus is a replacement lid for compatible FNS Plus 420Sqft filters. It seals the large cartridge filter housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy This Part Matters\u003c\/strong\u003e\u003cbr\u003eA damaged lid can compromise pressure and lead to water loss. Proper sealing ensures consistent filtration and system efficiency. Replacing a cracked lid prevents air intrusion and leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features and Specifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePentair manufacturer part number 178581\u003c\/li\u003e\n\u003cli\u003eFor FNS Plus 420Sqft filter\u003c\/li\u003e\n\u003cli\u003eClean\/Clr configuration\u003c\/li\u003e\n\u003cli\u003eFilter lid assembly\u003c\/li\u003e\n\u003cli\u003eOEM Pentair part\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eInstallation and Fitment Guidance\u003c\/strong\u003e\u003cbr\u003eTurn off pump and relieve system pressure before removal. Inspect and replace O-ring if needed during installation. Confirm by manufacturer part number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout the Pentair Brand\u003c\/strong\u003e\u003cbr\u003ePentair manufactures high capacity cartridge filters for residential applications. Their FNS Plus series is widely installed in the field. Using genuine Pentair lids ensures correct sealing and performance. Technicians rely on Pentair for trusted filtration components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon Service Context\u003c\/strong\u003e\u003cbr\u003eThis lid is typically replaced during major filter maintenance when structural cracks develop from age or pressure cycling.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52078615003410,"sku":"178581","price":310.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/PEN178581_0.jpg?v=1772563101","url":"https:\/\/www.aquaterrabackyard.com\/products\/pentair-178581-lid-assembly-clean-clr-420sqft-fns-plus","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}