... ,12V/24V,JGK-505valve with aluminum coil or JGK-502 valve with copper coil ,Dual tone electric air horn One pair ... or 24V,JGK-505valve(with aluminum coil)or JGK-502 valve(with copper coil) ,flat base cover,Dual tone electric air ... ,12V/24V,JGK-505valve with aluminum coil or JGK-502 valve with copper coil ,Dual tone electric air horn