Pentair 170021 FNS Plus 48 Sq Ft Filter Lid Assembly

What 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 48Sqft filter
• Filter lid assembly
• Sealing component
• OEM Pentair part

Installation and Fitment Guidance
Depressurize the system before removal. Inspect and lubricate O-ring as needed during installation. Confirm by manufacturer part number before ordering.

About the Pentair Brand
Pentair produces cartridge filters trusted in residential pool systems. Their replacement parts are built for direct compatibility. Using OEM Pentair lids helps maintain system integrity. Professionals rely on Pentair for reliable filtration equipment.

Common Service Context
This lid is often replaced during filter rebuilds when leaks develop around the tank top.