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Pentair manufactures professional-grade pool cleaning and circulation equipment
Damaged fittings can crack
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Pentair FNS Plus Filter Lid Assembly, 48 sq ft | 170021 Smart Company Pentair manufactures professional-grade pool cleaningWhat This Part Is Used For Pentair 170021 Lid Assembly 48Sqft, FNS Plus is a replacement lid for compatible FNS Plus 48Sqft filters. It covers and seals the filter tank. Why This Part Matters Maintaining a proper seal prevents pressure loss and water leaks. A damaged lid can disrupt filtration efficiency. Replacing it helps restore consistent filter performance. Key Features and Specifications Pentair manufacturer part number 170021 For FNS Plus