Pentair Genuine Replacement CNC Plus 520 Cartridge - 4 Pack | 179136 Bio-Dex Cleaner This has the water lily

This has the water lily feature and is dark gray in color

The pressure relief valve is a replacement part made by Polaris

the threaded side of this part should be near the bottom facing south

it also protects these parts from any outside influence that may disrupt them as they operate the cleaner and provide a deep thoroughly clean of the pool surfaces

Pentair Genuine Replacement CNC Plus 520 Cartridge - 4 Pack | 179136 Bio-Dex Cleaner This has the water lilyPentair Genuine Replacement CNC Plus 520 Cartridge 4 Pack Upgrade your pool filtration with Pentair 179136 CNC Plus 520 Cartridge 4 Pack. Genuine OEM parts for Clean & Clear Plus 520 systems. Features Genuine Pentair OEM Cartridges: Exact replacements for Clean & Clear Plus 520 filter systems. High Performance Filtration: Designed to capture fine debris, ensuring crystal clear water. Durable Polyester Construction: Built for longevity and consistent