Replacement tank o-ring (O-429) for Hayward in-ground pool filters. Fits Pro-Grid DE (DE2420, DE3620, DE4820, DE6020, DE7220), Micro-Clear DE (DE2400, DE3600, DE4800, DE6000), and Super Star-Clear/SwimClear cartridge filters (C2000–C5500, C2020–C5025, C7000). Formerly listed as DE2400K.
