Equip your truck with the Kleinn 411 direct-fit single chrome-plated roof-mount air horn system, featuring a single premium all-metal trumpet measuring 25 inches in length with an oversized bell end to deliver the ultimate big-rig sound. Engineered for universal semi-truck and commercial vehicle applications, this massive, heavy-duty roof-mounted configuration allows you to command the road with a deep, authentic, and deafening locomotive-style blast. Designed for clean external mounting on custom or commercial rigs, this high-performance horn kit requires an onboard pressurized air system and can be operated using a manual hand-pull air valve or an electronic solenoid valve. For a proper, leak-free setup right out of the box, the installation requires a Model 330 Roof Mount Air Horn Fittings Kit, providing the ideal balance of gleaming chrome style and serious acoustic presence that serious custom truck builds count on.

• 330 Fitting Pack required if not replacing an existing roof mount horn
• Manual Hand Pull Air Valve 310 or 311 / Solenoid Required
• Chrome-Plated Stainless Steel Construction
• Dimensions (in): 25 x 6 x 6
• Output (dB) @ 150 psi 150.1
• One Trumpet 24" w 1" Base
• 1/4" Airline Input