Kleinn Automotive Air Horns HDKIT-634 Train Horn And Onboard Air System w/HornAir Horn Kit Train Horn And Onboard Air System w Horn Train Horn And Onboard Air System w Horn; 150 PSI; Incl. Model 630 Triple Chrome Train Horn; 100 Percent Duty Cycle Bolt On Onboard Air System; 37 in. Tire And Up; SPECIFICATIONS: WARNING CA Proposition 65 Message: Warning: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.