This is an air brake hose, male, 90* elbow, brass quick disconnect for 1/4" hose, manufactured by Eaton for GM. This is a rather rare, combination of sizes together. The male threaded section is 1/2" and is 9/16" long. The quick disconnect tube side is for 1/4" air hose.

New. Never Installed. Bulk Overstock

1869x4x8