For newer Model 230 train horns with the VX6003 all-brass solenoid valve. Increase air flow and push the Model 230 Beast horn to unheard of decibel levels. The BlastMaster Plus provides everything you need to add an additional two VX6003 solenoid valves to your Model 230 Beast . Adding two more solenoids allows each trumpet to have a dedicated air source for dramatically increased flow and a train horn that will push your Beast over the edge. Prepare your eardrums to be destroyed.