Hayward Manual Air Relief Assembly for SwimClear Cartridge Filters and ProGrid DE Filters | DEX2420MAR2 Parts - Whitegoods / Flow Fittings pH — Phenol Red indicator

pH — Phenol Red indicator

Works for up to 30 days or longer depending on metal level

When the light output on your ColorCascade bubbler dims

If your Prowler or Warrior cleaner fails to power on or loses power intermittently

Hayward Manual Air Relief Assembly for SwimClear Cartridge Filters and ProGrid DE Filters | DEX2420MAR2 Parts - Whitegoods / Flow Fittings pH — Phenol Red indicatorThe Hayward Manual Air Relief Assembly (DEX2420MAR2) is the OEM replacement air relief valve assembly for Hayward SwimClear Multi Element Cartridge Filters and ProGrid DE Filters. This assembly allows trapped air to be manually purged from the filter tank before start up and during routine maintenance. Releasing air from the tank ensures the filter operates at correct pressure and prevents air locks that can affect flow and filtration performance.