The P449-03 Air Compressor Kit for use the the S-0A and D-0A Air Horns incorporates an oil-less compressor pump, and operates on 12 Volt D.C. electrical supply.  This kit also features an internal thermal disconnect switch to prevent the unit from damage in case it is operated beyond its design limits.  Tubing and fittings are included for installation with the S-0A or D-0A Air Horns.