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 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. come mounted 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 Locmotive Power
The HK9 features all the components of the 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 .
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 and features a long thunderous locomotive blast, and high-capacity Onboard Air Command Center in a package that fits on most Trucks & SUVs.
BOOST YOUR BLAST: 30% MORE OUTPUT
Unleash the full fury of your Demon™ 730 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!
WHAT'S IN THE BOX?
- (730) The Demon™ Stainless Steel Triple Train Horns
- (VX6003) High Performance Air Solenoid Valve (In the box with the horns)
- (6450RC) 200 PSI, 100% Duty, High Output, Waterproof Air Compressor
- (6450RT) 5-gallon, Inner Cortec Coated Steel Air Tank
- (FIT9) P/N 2151 Pressure switch & heavy-duty air tank fittings
- (INF-1) Tire inflator with analog glow in the dark gauge, 24' heavy duty air hose, and quick connect fitting for inflation. (P/N-1302 quick connect relocation kit is available for purchase, relocation of the air-coupler makes it easier to access your onboard air).
- Installation Essentials: Horn Button, Juice-1 thread sealant, 12 ft of 1/2" airline for horns,12 ft of 3/8" airline for compressor intake, wiring, and hardware.
Train Horn Specifications
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Model 730 "Demon" Triple Train Horns |
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Warranty |
2-Year Warranty |
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Construction |
Stainless Steel Trumpets, Zinc Alloy Base |
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Heavy Duty Brass Solenoid (12-Volt) |
P/N- VX6003 (51238 & 53814N Fittings Incl.) |
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Max Pressure |
200 PSI |
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Output (dB) @ 150 PSI |
157.8 dB |
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Dimensions (Mounted on Flat Rack Bar) |
22.5” L x 18.5” W x 7.25” H |
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Dimensions (Of each Individual Horn) |
21.75” Lg. - 17.75” Med. - 13.5” Sm. |
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Minimum Tank Size |
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 |
Air Compressor Specifications
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Model 6450RC Ultra Heavy-Duty Air Compressor |
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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 |
Mountable in any position except 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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Model 6450RT Slim Mount Air Tank |
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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 |
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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