& nbsp; & nbsp; & nbsp; & nbsp; Shiyan Yamao Auto Parts Co., Ltd. long-term supply by Hubei Sheng Automobile Electrical Appliance Co., Ltd. products of Dongfeng days Kam vehicle air horn: 3721070-C0300. It is a combination of QL11 and gas horn solenoid valve DF255, see figure. Also called: snail gas horn with electromagnetic components. Widely used in Dongfeng heavy duty truck. Customers are welcome to call letter to buy!