1/2 Gallon Air Tank Kit & 150 PSI H.D Air Compressor kit. For high pressure air horns systems that require an on board air system. Air tank made from heavy gauge steel for outdoor use. Compact design and weight. Both Air Tank and Air Compressor come complete ready for installation. Includes: 1/2 gallon air tank, 150 PSI air compressor, 1/4" air hose, fittings, air gauge, 90/110 PSI air pressure switch, hardware, and installation instructions.