The Manual Lanyard Hand Pull Air Valve is a practical and easy-to-use solution for activating air horns that require on board air systems. Simply pulling the lanyard sounds the horn, making it a convenient and reliable option for a variety of makes and models. This valve is easy to install on any 1/4 inch O.D air hose and comes with mounting hardware included. Its straightforward design and compatibility with most vehicles make it a versatile and essential addition to any air horn system.