Grand General is a leading manufacturer and distributor of high quality automotive accessories featuring an extensive selection of chrome and stainless steel accessories and more. This Floor Mount Stand and Air Valve Lever Set is specially designed for the Grand General Heavy Duty Train Horn, model number 69991. The set with brass valves controls the air flowing into the 69991 Train Horn to bring you the deep true train horn sound. Choose between the four-inch, seven-inch and 11-inch floor mount stand heights offered to suit your preference. This is the perfect companion for your Grand General Heavy Duty Train Horn!