Hayward Manual Air Relief Assembly for SwimClear Cartridge Filters and ProGrid DE Filters | DEX2420MAR2 Parts - Whitegoods / Flow Fittings The collar seats around the

The collar seats around the skimmer opening at the deck surface

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

pH — Phenol Red indicator

Use Metalfree™ as a weekly maintenance to prevent future metal staining

When the light output on your ColorCascade bubbler dims

Hayward Manual Air Relief Assembly for SwimClear Cartridge Filters and ProGrid DE Filters | DEX2420MAR2 Parts - Whitegoods / Flow Fittings The collar seats around theThe 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.