Viking Horns Air Tank and Air Compressor Kit For Horn On-Board Air System 1/2 (0.5 ) gallon air tank. Size: 6"L, 5-1/4"H, 5-1/4" in diameter. 120 PSI Air storage With braided 1/4" NPT hose, 1/4" air hose, fittings, hardware, fuse holder 150 PSI air compressor, Oil-less Design. Inflate time: 0.5 Gallon @ 120 PSI in 2 minutes 240 PSI air gauge, and 110/90 rated PSI air pressure switch Air compressor has rubber base bushings to reduce vibration