Pay in 4 interest-free payments of $40.73 Learn more
Ships within 48 hours · Estimated delivery Jul 30 - Aug 4
Black escutcheons provide a finished look
Physical role: Sits inside the diaphragm housing to provide a flexible seal that responds to system pressure changes
Pentair manufactures professional-grade pool cleaning and circulation equipment
By installing this genuine OEM component
Add this algaecide after balancing pH and alkalinity and with the pump running
Pentair FNS Plus Filter Lid Assembly, 48 sq ft | 170021 Smart Company Black escutcheons provide a finishedWhat 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