Viking Horns V103C Heavy-Duty 200 PSI Air Compressor For Train Horns 200 PSI max pressure, 100% duty cycle Works with up to 3 Gallons tanks Moisture and dust resistant. Oil-less Design With 1/4" NPT braided air hose, and removable air Intake filter Dimensions & Weight: 10-3/4" L x 4" W x 6-3/4" H. Weight: 9.5 lbs