The golden standard of solenoid valves, our Black Widow 1/2" Electric Valve gives you the high-flow performance needed to get the best out of your train horns and any other pneumatic accessories. Featuring a huge 16mm orifice, our 1/2" valve is made specifically to get the most volume out of your horns. Forged from solid stainless steel with all metal components, this solenoid valve is designed to stand the test of time. Our 1/2" valve is a direct replacement valve for the following train horns: - Shocker XL - Shocker S6 - Nathan AirChime K5LA - Nathan AirChime K5HA - Nathan AirChime K3 - Nathan AirChime P5 - Nathan AirChime P3 XL 16mm Orifice - Our valve utilizes a 16mm orifice! This means more air flow to your horns! 12v Compatible - This valve was designed for 12v applications. This will NOT work with a 24v system. Heavy Duty Stainless Steel Body Extreme Flow Rate