ARB High Performance Twin On-Board Compressor Kit - 12VFew 4x4 accessories offer as many advantages to off roaders as readily available on board air. Considered by 4x4 owners around the world to be a staple accessory for off road travel, an ARB 4x4 Air Compressor provides an immediate source of compressed air anywhere a 12 or 24 volt power source is available. Tires perform best when they are set at a pressure that is appropriate for the terrain. While highway use calls for a relatively high pressure