Bahco BP218 Air Blow Gun has a brass inlet and meets the OSHA requirements. It has a 1/4in connector.

Specification
Air Inlet BSP: 1/4in.
Output pressure: 2.07bar.
Working pressure: 6.3bar.
Fluid delivery: 190-250 ml/min
Airflow: 158 l/min.
Maximum Air pressure input: 11 bar
Length: 210mm.
Weight: 0.15kg.

Sound pressure level: 80 dBA.