This is a Prime 920 that we have named "Optimus Prime"
with 40 gallons of air hooked up and a 1'4 turn valve
Disclaimer: NOT FOR KIDS- doing this action is done at my own risk. Dealing with Genuine Locomotive Horns Such as Nathan Airchime and Leslie Controls produce extreme loudness and these horns do NOT comply with Local Laws and authority and this is A MISDEMEANOR. operating such devices WILL cause permanent hearing damage or loss. Operate such horns and Air Raid Sirens at your own risk.