Zodiac/Jandy NeverLube Backwash Valve Diverter Kit (R0552300) cfrfilters and this Filbur FC-2770 cartridge

and this Filbur FC-2770 cartridge is designed for 7CH-90 and PSD90P4 applications

Fits compatible 8428 applications

A bumper is useful because it helps cushion contact with pool walls and surfaces

Useful when original generators are unreliable or have failed

and the rest of the system

Zodiac/Jandy NeverLube Backwash Valve Diverter Kit (R0552300) cfrfilters and this Filbur FC-2770 cartridgeThe Zodiac and Jandy NeverLube backwash valve diverter kit is designed for compatible valve applications where the internal diverter section of the backwash valve needs replacement. A kit like this is useful because it provides a more coordinated repair option when restoring one of the main internal flow routing components of the valve. This replacement is especially useful when the original diverter is worn, damaged, sticking, or no longer switching