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KL HK7
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Model HK7: Universal ProBlaster ABS Triple Train Horn & Onboard Air System
Why the Beast Rules Its Class!
For the driver who demands a professional-grade locomotive blast without the investment of a full-metal HK9 system, The Beast™ Model HK7 has arrived. Engineered to outperform everything in its category, the high-impact ABS construction of the Model 230 Beast™ horns delivers a sharp, aggressive harmonic chord. This setup cuts through road noise with surgical precision, providing the signature Kleinn locomotive-style blast that defines a true statement of authority.
The Practical Pneumatic Powerhouse
The Model HK7 delivers elite performance without the bulk. Driven by the industry-exclusive Model 6350RC Waterproof Air Compressor, this system is more than just a horn—it’s a professional-grade onboard air command center. Whether you are delivering a deafening blast, inflating 33” tires, managing air bags, or engaging lockers, the HK7 provides high-pressure pneumatic power exactly when you need it.
Versatile Mounting Options
The Model HK7 is a lightweight, versatile system featuring the popular Model 6351RT 3-Gallon Air Tank internally coated for superior corrosion resistance and designed for a high-capacity/small-footprint balance, this tank is perfect for easy frame-rail or under-body mounting. For maximum installation flexibility, the detachable composite ABS horns can remain on the included flat rack mounting plate or be removed and mounted individually to fit tight spaces.
THE VERDICT: The Model HK7 "Beast™" is the definitive choice for drivers who demand a professional-grade blast and rock-solid reliability in a package size designed to fit almost any truck or SUV. The Beast delivers the authentic roar of locomotive excellence without the "Demon" HK9 or HK9-Slimline price tag.
WANT THE HORNS EVEN LOUDER?
Unleash the full fury of the Beast™ 230 Horns!
Push the 230 Beast™ horns to the edge of sanity with the Ultra BlastMaster™ (Model 6885). This upgrade allows you to unleash the fury of 30% more power by adding two additional Model VX6003 high-flow solenoids and swapping the standard 1/4" tubing for a massive 1/2" airline.
The result is a nasty twist to a classic: devastating, bone-rattling decibel levels that demand respect across entire city blocks. Experience the 230 Beast in its most aggressive form—because when it comes to the ultimate train horn, "TOO LOUD" happens to be just right.
TOO LOUD? TOO BAD!
Model HK7 Includes:
Train Horn Specifications
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Model 230 "Beast" Triple Train Horns |
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Warranty |
1-Year Warranty |
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Construction |
Composite ABS Trumpets, Zinc Alloy Base |
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Heavy Duty Brass Solenoid (12-Volt) |
P/N- VX6003 (51438 & 53814N Fittings Incl.) |
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Max Pressure |
150 PSI |
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Output (dB) @ 150 PSI |
155.1dB (156.9 dB w/ 6885 Upgrade Kit added) |
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Dimensions (Mounted on Flat Rack Bar) |
18.5” L x 18” W x 7” H |
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Dimensions (Of each Individual Horn) |
18.5” Lg. – 16.5” Med. - 14.5” Sm. |
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Minimum Tank Size Required |
2.5-Gallon |
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Airline Length and Size Included |
12’ of ¼” OD Airline |
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Upgrade kit compatibility |
Use Model 6890 |
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Air Compressor Specifications
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Model 6350RC 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 |
150PSI |
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Max Amp Draw |
21 Amps |
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Dimensions |
9.25” L x 4” W x 6.50” H |
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Mounting Holes |
7.32” 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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Tank Fill Rate 0-150 PSI |
(2.5 Gal) 4 Min. 35 Sec. (+/- 10 Sec.) |
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Tank Fill Rate 110-150 PSI |
(2.5 Gal) 59 Sec. (+/- 5 Sec.) |
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Air Tank Specifications
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Model 6350RT Air Tank |
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Warranty |
1-Year |
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Tank Capacity |
3-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 – 1/2" 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 |
21” L x 8” W x 10” H |
Installation Links:
Compressor Overview & Instructions
Horn Solenoid Wiring Instructions
230 Horn Disassembly Instructions
6885 Blastmaster Upgrade Kit Instructions

$839.95
Kleinn Automotive Accessories is committed to delivering high-quality products to our customers. We stand behind the craftsmanship and materials of our products by offering a comprehensive one-year limited warranty. This warranty is extended to the original purchaser, ensuring that when our products are installed properly and used under standard conditions, they will be free from defects in workmanship and materials for a period of one year from the original date of purchase.
This warranty encompasses a promise that the product you have purchased will perform as expected under normal use conditions and will not suffer from flaws in materials or craftsmanship. However, it is important to note that this warranty does not cover any damage that results from abusive use, operation that is not in line with the product’s intended purpose, or harm resulting from exposure to harsh environmental conditions. In the event that a product is found to be defective within the warranty period following a thorough inspection, Kleinn Automotive Accessories reserves the right to either repair or replace the defective item at no additional charge to the purchaser. It is our goal to ensure that our products meet the high standards that our customers expect, but we also want to clarify that Kleinn is not responsible for covering any costs related to the installation of our products, nor are we liable for any loss or damage that may occur as a result of the repair or replacement process of any product under warranty.
Understanding the specific needs of our customers and the demands placed on certain products, Kleinn Automotive Accessories is pleased to offer an exclusive extended two-year warranty for our 6450/6650 Compressors and 730 Horns. This special warranty extension reflects our confidence in these products’ durability and performance. Eligible products under this extended warranty will enjoy all the benefits of our standard one-year warranty with an additional year of protection, totaling two years from the date of purchase. This extended warranty coverage ensures that these specific models, recognized for their robustness and reliability, receive the extra assurance customers desire for these critical components.
Should you need to initiate a return under the warranty, we have a straightforward process designed to make it as convenient as possible for our valued customers. To start, you will need to email a copy of your sales receipt, which must be dated within the past year for standard warranty claims or within the past two years for claims under the extended warranty for the 6450 Compressors and 730 Horns. This email should be directed to our Warranty Manager and include your full name, email address, telephone number, and a concise description of the problem you are experiencing.
Upon receipt of your email, a dedicated representative from Kleinn Automotive Accessories will reach out to you directly. Our first step will always be to attempt to resolve the issue through technical support, aiming to provide a quick and effective solution. If the problem cannot be addressed remotely, our representative will issue a Return Authorization number. This number is crucial as it will identify your return throughout the inspection process. You are then required to send the product back to Kleinn Automotive Accessories for a comprehensive physical inspection.
Upon inspection, if the product is determined to be defective due to issues in workmanship or materials, Kleinn will undertake to either repair or replace the product at our discretion. We are committed to ensuring that our customers receive products that meet our high-quality standards, and we will make every effort to resolve warranty claims to your satisfaction. However, if the inspection reveals that the product does not have a material defect, we will return the unit to the customer. In such cases, the shipping costs for the return will be the responsibility of the customer.
Your item must be in its original unused condition to be returned, unless there is a manufacturer defect. You must return the item within 30 days of your purchase.
1. Please email support@kleinn.com to request a refund and we will assign you a Return Authorization #.
2. Mail your returned item to:
Kleinn Automotive Accessories
Returns Department
4045 N Highway Drive
Tucson, AZ 85705
3. Include in your package a signed letter stating the reason for your return and the original receipt.
Merchandise that has been worn, used, or altered will not be accepted for return or exchange.
All returns are subject to a 15% restocking fee, which will be deducted from your refund. If shipping and handling fees were applied to your order, they are non-refundable.