For Model 230 Beast train horns with the Vortex 6 brass solenoid valve. Increase air flow and push your train horn to even higher decibel levels. The Ultra BlastMaster provides everything you need to add an additional two VX6003 solenoid valves to your Model 230 Beast train horn. 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, they're screwed.IMPORTANT NOTE: We upgraded the model 230 horns to the Vortex 6 all brass solenoid valve in 2017. Before ordering this kit for your 230 horn verify your 230 horn has the all brass solenoid valve. Model 230 horns still in the retail box will indicate if it includes the upgraded Vortex 6 valve on the retail box. There will be a picture of the valve on the retail carton.