Our biggest and loudest train horn system equipped with a slim design 3-gallon air tank! The Demon Model 730s massive & detachable XCR 2.0 spun steel trumpets (18.25, 14.75, 10.5) allow tons of installation options. Includes a high output 150 psi, 100% duty compressor, slim profile 3-gallon tank for easier installation and tire inflation kit with storage bag. Can power your horns as well as other accessories like air bags and small air tools. -For the clinically insane, the 730 can be upgraded by adding an Ultra BlastMaster valve upgrade (P/N 6890) making it the loudest, largest and most aggressive train horn on the market.