Pentair 178553 FNS Plus 50/100 Sq Ft Filter Lid Assembly

What This Part Is Used For
Pentair 178553 Lid Assembly - CNC, 50/100Sqft, FNS Plus is a replacement lid for compatible FNS Plus 50Sqft and 100Sqft filter models. It seals the cartridge filter housing during operation.

Why This Part Matters
Maintaining a proper seal prevents air intrusion and water leaks. A damaged lid can reduce filtration efficiency and system pressure. Replacing the assembly restores normal filter performance.

Key Features and Specifications

• Pentair manufacturer part number 178553
• For FNS Plus 50Sqft and 100Sqft filters
• CNC lid assembly configuration
• Filter tank sealing component
• OEM Pentair part

Installation and Fitment Guidance
Depressurize the system fully before servicing the filter. Inspect and lubricate the O-ring if required. Confirm by manufacturer part number before ordering.

About the Pentair Brand
Pentair produces cartridge filters known for reliable pool filtration. Their OEM replacement parts are engineered for direct compatibility. Using genuine Pentair lids helps maintain system integrity. Technicians trust Pentair for consistent equipment performance.

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