Train Air Horn Kit DC 12V 150PSI With 6 Liter Tank For Truck RV Air Horn System. Long-distance driving will inevitably cause changes in tire pressure. Failure to deal with them in time will lead to serious consequences. But what if you are on the highways or rural roads that are inaccessible? Let this air compressor pump help you. It not only has good performance but also does not cover an area of land. You can put it in your trunk at will, which is very helpful for urgent needs. Safe Driving: It will automatically cut off at 8bar, and automatically open at 6bar to ensure that your car tires are kept at the appropriate pressure state and protect your driving safety...