Aladdin O-Ring Replacement For DEX2420Z8A Hayward Pro-Grid O-Ring (set of 2) Rebuild Kit
This service and repair kit is designed for Rebuild your Hayward Pro-Grid Filter DEX2420Z8A Air ReliefWill have:1: O-442 (Small O-Ring) goes on the air relief  body1: O-230 (Large O-Ring) goes on the tank before the air relief body