Model HK9: Universal ProBlaster "Demon" 730 Stainless Steel Triple Train Horn & 5-Gal. Onboard Air System
KL HK9FE
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Model HK9: Universal ProBlaster™ Demon™ Steel Triple Train Horns & 5-Gal. Onboard Air System
Why The "Demon" HK9 is the Undisputed King of the Road!
When the situation demands more than just a loud horn, the Demon 730 stainless steel horns dominate the road! Delivering a sonic roar that cuts through sirens, heavy machinery, and chaotic traffic, these precision-tuned steel horns are the ultimate train horn solution. Featuring XCR 2.0™ coated horns (also available in Reaper Red or Freedom Edition), the Demon 730 thrives in the elements, providing unmatched reliability. They come mounted on a flat rack, but each can be removed from the rack and mounted separately for maximum installation flexibility.
Massive Pneumatic Power!
Designed for those who refuse to compromise, the HK9 is the ultimate upgrade for your rig. Powered by our industry-exclusive (6450RC) waterproof compressor, this high-performance system is more than our loudest horn; it is an integrated onboard air command center. Whether you are delivering a deafening blast, inflating 37" tires, managing air bags, or engaging lockers, the HK9 provides professional-grade pneumatic power anytime you need it.
High-Capacity Onboard Air: Sustained Locomotive Power
The HK9 features all the components of the HK9-Slimline kit but uses a larger, 5-gallon (6450RT) air tank. This high-capacity air tank offers extended horn blasts and expedited tire inflation.
Short on space? The Model HK9-Slimline includes a 3-gallon (6351RT) air tank with a smaller footprint.
WHY CHOOSE THE "DEMON" HK9 KIT?
- The Demon™ 730 Train Horns: Precision-tuned stainless steel trumpets that deliver the loudest, most aggressive locomotive roar in the Kleinn lineup. These horns are built to dominate any environment and cut through extreme ambient noise.
- Undisputed Authority: Featuring XCR 2.0™ corrosion-resistant coating, these horns are engineered for unmatched reliability and a premium aesthetic that thrives even in the harshest elements.
- Industry-Leading Waterproof Compressor: Driven by the exclusive 6450RC submersible compressor, providing a 100% duty cycle and consistent high-pressure performance for the most demanding tasks.
- Massive 5-Gallon Air Reservoir: The high-capacity 6450RT tank provides sustained locomotive power, allowing for extended horn blasts and the fastest tire inflation times for up to 37" tires.
- Integrated Air Command Center: More than just a horn—this system is a professional-grade pneumatic hub capable of managing air bags, lockers, and pneumatic tools with surgical precision.
- Versatile Installation: While they come on a heavy-duty flat rack, the detachable design allows the steel trumpets to be mounted individually to fit the specific configuration of your rig.
THE VERDICT: Designed specifically for those who want to dominate the road, the HK9 Demon™ is your weapon of choice. It stands as the largest and loudest train horn in our arsenal, featuring a long thunderous locomotive blast and a high-capacity Onboard Air Command Center in a package that fits on most Trucks & SUVs.
Short on space? The Model HK9-Slimline includes a 3-gallon (6351RT) air tank with a smaller footprint .
WHAT'S IN THE BOX?
- (730) The Demon™ stainless steel triple train horns: Precision-tuned for the ultimate locomotive sound.
- (VX6003) High performance air solenoid valve: For maximum airflow control.
- (6450RC) Waterproof air compressor: 200 PSI, 100% duty cycle, fully sealed.
- (6450RT) 5-gallon steel air tank: High-Capacity, Cortec anti-corrosion coating.
- (FIT9) Fitting pack: Includes P/N 2151 pressure switch and tank fittings.
- (INF-1) Tire inflator kit: 24' air hose and glow-in-the-dark gauge.
- Installation essentials: Horn button, Juice-1 thread sealant, wiring, and hardware.
BOOST YOUR BLAST: 30% MORE OUTPUT
Unleash the full fury of your Demon™ 730 Train Horns!
Experience the Demon™ 730 Horns in all their glory! The Ultra BlastMaster™ (6890) re-engineers your system’s architecture, maximizing airflow to deliver a devastating, high-decibel blast. It’s simple physics: more air equals more output. We ditched the standard 3/8” lines in favor of massive, dedicated 1/2” airlines leading to three High-Flow VX6003 brass solenoids—one for every individual horn.
This isn't just an upgrade; it’s a shocking twist on a classic, delivering soul-shaking locomotive blasts that command immediate attention. Overwhelm the senses and dominate the streets with the absolute peak of train horn intensity at your fingertip.
TOO LOUD? TOO BAD!
Air Horns vs. Train Horns
Find Your Signature Blast
Compact Air Horn Series
Engineered for "Emergency Vehicle" authority. This series delivers a sharp, high-frequency blast designed to cut through ambient noise instantly. With 3.5" bells, these horns produce a piercing scream that commands attention in heavy traffic.
- Compact Horns: 102 / 130 / 141
- Kits: HK2 / HK3 / HK4
- Compact Horns: 101 / 102-1 / 130-1 / 141-1
- Kits: HK1 / HK2-1 / HK3-1 / HK4-1 / HKUTV / Vehicle Specific Kits: 102, 102-1
Train Horn Series
Don’t just make noise—make an impact. Engineered with massive 6-7" bells, our Train Horns move huge volumes of air to create a deep, earth-shaking rumble. This is the authentic tone of a classic 40,000-lb locomotive.
- Train Horns: 500 / 501 / 502 / 630
- Kits: HK6 / HK8
- Train Horns: 220 / 230 / 730
- Kits: HK5 / HK7 / HK9 / HK9-Slimline
Professional-grade engineering. Legendary Kleinn Performance.
Train Horn Specifications
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Triple Steel Train Horns |
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Part Number |
Model (730) “The Demon" |
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Number of horns |
3 (Flat Rack or Individual Mount) |
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Warranty |
2-Year Warranty |
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Construction |
Stainless-Steel Trumpets |
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Heavy Duty Brass Solenoid (12v) |
P/N- VX6003 (51438 & 53814N Fittings Incl.) |
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Max Pressure |
200 PSI |
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Output (dB) @ 150 PSI |
157.8 dB (159.6 dB w/ 6890 Upgrade Kit) |
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Dimensions (On Flat Rack Bar) |
22.5” L x 18.5” W x 7.25” H |
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Dimensions (Each Individual Horn) |
21.75” Lg. – 17.75” Med. - 13.5” Sm. |
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Minimum Tank Size Required |
2.5-Gallon |
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Airline Length and Size Included |
12’ of ½” OD Airline |
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Upgrade kit compatibility |
Use Model 6890 |
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Air Compressor Specifications
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Ultra Heavy-Duty Air Compressor |
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Part Number |
Model (6450RC) |
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Warranty |
2-Year Extended (6450RC, 6650RC, & 730) |
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Compressor Type |
Waterproof Sealed, Oil-less |
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Motor Type |
Permanent Magnetic Motor |
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Waterproof & Submersible |
Sealed Internally (Must install “Snorkel” system) |
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Compressor “Snorkel Kit” |
Remote Air Filter Relocation Kit- 12' 3/8” Airline |
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Voltage |
12-Volt DC |
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Duty Cycle |
100% @ 100 PSI (@ 72° F) |
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Flow Rate |
@ 0 PSI (13.8 Volts): 2.5 CFM |
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Max Pressure |
200PSI |
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Max Amp Draw |
23 Amps |
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Dimensions |
11.25” L x 4” W x 6.50” H |
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Mounting Holes |
8.90” L x 3.31” W (5mm Diameter) |
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Mounting Note |
Do not mount upside down |
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Pressure Switch |
P/N 2151 (Works with 52175 Safety Valve) |
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Air Tank Specifications
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5-Gallon Air Tank |
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Part Number |
Model 6450RT |
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Warranty |
1-Year |
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Tank Capacity |
5-Gallon |
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Construction |
All Steel Design - Gloss Black Epoxy Finish |
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Internal Coating |
Cortec Internal Anti-Corrosion Coating |
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Mounting Legs |
2 Legs w/ 4 Mounting Points |
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Air Tank Ports |
6 – 1/4" NPT Ports & 1 – ½” NPT Ports |
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Mounting Hardware |
Fitting Pack - 4 Bolts, Nuts, Washers |
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Max Pressure |
200 PSI |
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Dimensions |
19” L x 10” W x 13” H |
Air Tank Fill Rates
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Tank Capacity |
Tank Pressure Range |
Tank Fill Rate |
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2.5 Gallon |
0 - 150 PSI |
2 Min. 54 Sec. (+/- 10 Sec.) |
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2.5 Gallon |
110 - 150 PSI |
54 Sec. (+/- 5 Sec.) |
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5 Gallon |
0 - 150 PSI |
5 Min. 57 Sec. (+/- 10 Sec.) |
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5 Gallon |
110 - 150 PSI |
1 Min. 53 Sec. (+/- 5 Sec.) |
Installation Instruction Links:

$1,329.95