Kleinn Model 412 Single Rectangular 25" Roof Mount Air Horn, Chrome

The Kleinn Model 412 is a single rectangular 25" roof mount air horn with a chrome finish for trucks and SUVs running onboard air. It's universal and the squared-off alternative to Kleinn's round 411.

The horn measures 25" x 8.5" x 4.5" and comes with a 1/4" compression fitting for the underside air inlet and nuts, bolts and washers. Kleinn rates it at 150.8 dB at 150 PSI.

The rectangular trumpet sits lower on the roof than a round horn and looks right at home on work trucks and haulers. With the air feed coming up through the base, no plumbing shows on top.

This is a single horn and doesn't include a valve or airline. You'll need an air system with a 120-175 PSI cut-off, at least a 1.5-gallon tank, a 12V electric or manual pull valve and 1/4" airline. New installs require Kleinn's 330 roof mount fitting pack, sold separately. Kleinn doesn't publish a model-specific install guide.

For a round trumpet, see the Model 411. The Model 401 gives you two round horns. 1-year limited warranty.