ARG-1 Strainer Service Kit. ARG 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 08/01/01as an Individual