Gravity Spray Paint Gun Paint Painting Coating Air Spray Gun mild Steel Paint Spray Gun with Bucket. The Air Spray Gun is a pneumatics tool that is perfect for a variety of projects. It has an operating pressure of 30-50 psi and a capacity of 236 ml. The nozzle size is 1.2 mm and the air inlet is 1/2 inch. The air consumption is 115-700 lpm. The material is mild steel.