This is a hose clamp by Miller Industries for the Vulcan Modular 880/890 & 896/897 light duty wreckers. It is located on the outer stinger and is attached by one bolt. See features for related hardware and brochures for reference chart.
Related Hardware:
7/16" NF x 3/4" Hex Bolt (9041353)
7/16" Lock Washer (12-0400487)