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The Ultra BlastMaster kit is made specifically for the Model 730 train horn and adds two VX6003 solenoid valves to increase airflow to each trumpet. Intended to raise the Model 730 Demon’s sound output, the kit supplies the extra solenoids and plumbing required to give each trumpet a dedicated air source and significantly boost horn volume.
Kleinn Ultra HK9 730 Horns BlastMaster Valve Upgrade Kit
