Welcome to Defender Canada! 
Groco
Groco ARG Series Replacement Drain Nut with O-Ring - ARG-506
Item: #867556 | Part Number: ARG-506$6.44
Description
Features: Groco part number ARG-506 is a replacement sight glass drain plug for ARG strainers manufactured before 08/01/2008 O-Ring included Installation and Service Guide
Groco ARG Series Replacement Drain Nut with O-Ring - ARG-506 Item # 867556
Description
Features:
- Groco part number ARG-506 is a replacement sight glass drain plug for ARG strainers manufactured before 08/01/2008
- O-Ring included