Pentair Genuine Replacement CNC Plus 520 Cartridge - 4 Pack | 179136 Bio-Dex Cleaner The pressure relief valve is

The pressure relief valve is a replacement part made by Polaris

Retro‑fit adapter 236014 for Pentair A&A TurboClean in‑floor cleaning heads—9/16″ internal orifice

Free-Flow Core reduces pressure and extends filter cycle duration

Verify that replacement head matches existing collar and flow‑rating

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

Pentair Genuine Replacement CNC Plus 520 Cartridge - 4 Pack | 179136 Bio-Dex Cleaner The pressure relief valve isPentair 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