KleinnAir Horns 411 25-Inch Roof Mounted Horn - Copper

Very long loud and horny really makes you feel like your running a train. does require a properly sized hose don't try to operate if you don't have a big enough hose or low pressure. Feed'er 120 from 3/8 line and everyone will hear'er comin form miles.

Just as I expected it to be. Very easy to mount.

Great horn, looks and sounds nice. Sounds more like a fog horn, clean sound not blaring like the emergency horns. Have only run it on shop air line at 100 psi, not currently installed on the truck.

exactly what I was looking for. nice deep semi truck tone.

Sounds great on my Kenworth!