Viking Horns V101C Heavy-Duty 150 PSI Air Compressor For Train Horns 150 PSI max pressure, 50% 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: 9-1/2" L x 4" W x 6-3/4" H. Weight: 7-3/4 lbs