Pentair Control System Replacement Transformer (521233) wcooper Matching the correct stainless steel

Matching the correct stainless steel and graphite gray wave-style internal helps preserve intended fit and a more premium appearance

Replacement part number: DEX2420EA

This cartridge has practical value because a Pleatco replacement is designed to restore the intended filter performance without changing the larger filter housing

Wrench tool for compatible Polaris Letro wall fitting service

Pentair Control System Replacement Transformer (521233) wcooper Matching the correct stainless steelA four pack of Clean & Clear Plus 520 cartridges refreshes the full filtration set in compatible Pentair cartridge filters. Replacing all cartridges together helps balance flow across the filter and can improve water clarity after a long service interval. This set is ideal when pleats are stained, collapsed, heavily scaled, or no longer cleaning effectively. Choose this replacement when you want a clean, part specific repair rather than forcing a