Product details:

A valve designed for train horns by a company that knows train horns the best! Our 3/4 Brass Electric Air Valve features a massive 20mm orifice, making it perfect for authentic train horns or any other pneumatic application that requires extreme airflow. Constructed from solid brass with all metal hardware, our 3/4 Brass Electric Air Valve is built to last just as long as your train horns! If you want to get the most out of your Nathans or any other locomotive horn, you need this valve!