Pentair Backup Ring, Stainless Steel, for FNS Plus and CNC Plus | 195339 HASA C-Series Single Element Heaters (All

C-Series Single Element Heaters (All Wattages)

Their valves and filter components are built for high-flow applications

E-Stop & Key Valve—offering superior safety

timeless finish for your mid-sized dual-element heating system

Versatile Set: Includes a loveseat

Pentair Backup Ring, Stainless Steel, for FNS Plus and CNC Plus | 195339 HASA C-Series Single Element Heaters (AllWhat This Part Is Used For Pentair 195339 Backup Ring FNS Plus CNC Plus Stainless Steel is a replacement backup ring for compatible Pentair FNS Plus and CNC Plus filter systems. It supports proper sealing within stainless steel filter assemblies. Why This Part Matters A backup ring helps maintain correct O ring compression under pressure. Replacing a worn ring restores secure sealing and prevents leaks. Proper internal sealing protects filter