1/4" outer diameter air hose for air horns.
This pressure140/170 air switch is designed for high-pressure on-board air systems. Ideal for air horns that require high air pressure. Preset to turn on the compressor when tank pressure is below 140 psi, and turn off the compressor when the air tank pressure reached 170 psi, with a tolerance of Â± 10%. Can operate reliably up to 3.5 amps. For 12 volt power source. With ?" male pipe thread, and 1/4" push-on electric terminals.