ARG-1 Strainer Service KitARG Series raw water strainer service kit.Compatible with the Groco ARG 500, 750 and 755 series strainers.In the Box:. (1) - 2-153 - Sight Glass O-Ring. (1) - 2-135 - Cap O-Ring. (1) - 2-228 - Cap O-Ring. (4) - PFW-2 Set - Sight Glass Bolt Washer. (1) - 2-011 - Drain Plug O-ring Before 08/01/01. (1) - 2-111 - Drain Plug O-ring After 08/01/01. *Sold as an Individual