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Kleinn HK9 is the Model HK9: Universal "Demon" Steel Triple Train Horn / Onboard Air System | 150 PSI | 5-Gallon. Match the exact manufacturer part number, configuration, voltage, pressure, dimensions, connections, included components, and vehicle application before ordering.
Key Features
- Includes a high output 150 psi, 100% duty compressor, 5 gallon tank and tire inflation kit with storage bag.
- The Demon Model 730s massive & detachable XCR 2.0 spun steel trumpets (18.25, 14.75, 10.5) allow tons of installation options.
Fitment
| Fitment Status | Universal only by exact specifications |
|---|---|
| Required Verification | Voltage, pressure, flow, duty cycle, dimensions, ports, air-line size, wiring, mounting, and companion components |
Specifications
| Brand | Kleinn Air Horns |
|---|---|
| Manufacturer Part Number | HK9 |
| Product Type | Air Horn Kits |
| Fitment Type | Universal |
| Condition | New |
| GTIN | 819147010205 |
| Part Number | Model (730) “The Demon" |
| Number of Horns | 3 (Flat Rack or Individual Mount) |
| Warranty | 2-Year Warranty |
| Construction | Stainless Steel Trumpets |
| Brass Solenoid | P/N VX6003 (12-Volt) |
| Max Pressure | 200 PSI |
| Output (dB) | 157.8 dB (159.6 dB w/ 6890 Upgrade Kit) |
| Rack Dimensions | 22.5” L x 18.5” W x 7.25” H |
| Trumpet Lengths | 21.75”, 17.75”, 13.5” |
| Airline Size | 1/2" OD Airline |
| Part Number | Model 6450RC |
| Warranty | 2-Year Extended (6450RC, 6650RC, & 730) |
What's Included
- (730) The Demon™ stainless steel triple train horns: Precision-tuned trumpets on a detachable flat rack.
- (VX6003) High performance air solenoid valve: Pre-installed 3/8" NPT heavy-duty brass air valve with 12' of 1/2" heavy-duty airline.
- (6450RC) Waterproof air compressor: 100% Duty Cycle — 200 PSI fully sealed unit engineered for harsh environments.
- (6450RT) 5-gallon air tank: Features an internal anti-corrosion coating for superior rust resistance.
- (INF-1) Tire inflator kit: 24’ heavy-duty air hose, tire inflator with luminescent gauge, and quick-connect coupler in a canvas storage bag.
- (2151) Pressure switch: Automated air management (110 PSI on / 150 PSI off).
- Installation essentials: Horn button, Juice-1 thread sealant, high strength airlines, and all hardware.
About Kleinn Air Horns
Kleinn develops vehicle-specific and universal train horns, air horns, onboard-air systems, compressors, tanks, valves, controls, and remote-start systems. Every pressure, electrical, dimensional, and vehicle requirement remains exact-part specific.
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Frequently Asked Questions
What must match before installing Kleinn HK9?
Confirm voltage, pressure, flow, duty cycle, port and air-line sizes, dimensions, mounting orientation, wiring load, and compatibility with every connected component.
What air system is required for Kleinn HK9?
Match the horn's required pressure, airflow, valve, tubing size, compressor duty cycle, and tank capacity. A compressor or tank is included only when the exact listing states it.
Where can Kleinn HK9 be mounted?
Use a rigid protected location with adequate clearance, drainage, airflow, and safe routing for wiring and air line. Keep every component away from heat, moving parts, road impact, and water exposure beyond its rating.
Installation Instructions
Confirm Kleinn part number HK9 and the complete application before beginning. Mount every component in the specified orientation, use correctly sized fused wiring and protected grounds, route air line away from heat and moving parts, seal only the approved threads, leak-test the system, verify cut-in and cut-out pressure, and confirm safe operation before driving.
Kleinn Air Horns
Kleinn automotive air horns and onboard air systems deliver the sound, stored air, and vehicle-specific hardware needed for truck, Jeep, SUV, and off-road builds. Shop complete Kleinn horn kits, direct-fit onboard air systems, standalone air horns, 12-volt compressors, air tanks, valves, pressure switches, gauges, fittings, controls, and compatible remote-start systems. Use the year, make, and model filter when shopping vehicle-specific kits, then confirm the exact manufacturer part number, engine, body configuration, mounting space, electrical requirements, operating pressure, tank capacity, and included hardware. The live assortment covers popular Ford F-150, Raptor, and Super Duty; Chevrolet Silverado and GMC Sierra; Ram trucks; Jeep Wrangler and Gladiator; Toyota; Nissan; Infiniti; and universal applications. What Kleinn Air Horns and Onboard Air Systems Cover This collection includes complete air-horn packages and the individual parts needed to build, upgrade, or service a pn...
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