HornBlasters Outlaw 127H Black Train Horn Kit


Rated 5.0 out of 5
40 Reviews

Hear these horns now!


One of our most popular entry-level train horn kits, our Outlaw Black 127H Train Horn Kit is easy to install and packs heaps of power at a budget-friendly price. If you are wanting that authentic train horn sound for an affordable cost, this is the perfect kit for you.

As one of the loudest train horns we carry, our Outlaw Black Train Horn packs a lot more punch than it’s size would lead you to believe. With an install footprint much smaller than other train horns, our Outlaw Black Train Horn is a great alternative to larger train horns when space is limited without losing volume.

Our HornAir 127H Air Source Unit that we bundled with our Outlaw Black Train Horn is the ideal air source unit for tight install requirements or tight budgets. As our smallest air source unit, our HornAir 127H Air Source Unit can easily fit in the trunk of a car or a toolbox. As a non-enclosed unit, we highly recommend keeping the unit in a space that is dry and free of debris. While our Outlaw Black 127H Train Horn Kit might seem small, you still get a stunning 5 seconds of continuous blast time out of the gallon and a half tank and a lightning-fast recharge time of 90-120 PSI in only 35 seconds! Like all HornBlasters Horn Kits, the Outlaw Black 127H Train Horn Kit is a complete kit with all required components and detailed instructions included.

While this kit gives you everything you need to get up and going, make sure to pick up our wireless remote to get the most out of this kit!

(Note: Tank mounted air compressors are not fully sealed.  For this reason, the manufacturer recommends the tank/compressor system be mounted in the upright position in an enclosed space away from moisture, dirt, debris, etc...)

  • Heavy Duty Black Finish Train Air Horns
  • 120 PSI Air System
  • All-inclusive Train Horn Kit
  • Max Honk Time: 3 to 5 Seconds
  • Part Number: HK-C3B-127H
  • Horn: HornBlasters Black Outlaw Train Horn
  • Horn Length: 18.5″ (469.9 mm)
  • Horn Width: 15.5″ (393.7 mm)
  • Horn Height: 12.5″ (317.5 mm)
  • Horn Weight: 15 lb (6.8 Kg)
  • Horn Fitting: 1/2" Tube
  • Air Source Unit: HornBlasters 127H
  • Working Pressure: 120 PSI
  • Air Source Length: 15.0″ (381 mm)
  • Air Source Width: 6.0″ (152.4 mm)
  • Air Source Height: 13.0″ (330.2 mm)
  • Air Source Weight: 13.75 lb (6.24 Kg)
  • Air Source Kit Tank: Viair 1.5 Gallon 4 Port Tank
  • Volume: 1.5 gal (6.6 L)
  • Ports: 4 x ¼″ NPT Ports
  • Tank Length: 15″ (381 mm)
  • Tank Width: 6″ (152.4 mm);
  • Tank Height: 8.5″ (215.9 mm)
  • Tank Weight: 8.65 lb (3.92 Kg)
  • Air Source Kit Compressor: Viair 275C Air Compressor
  • Voltage: 12 volts DC
  • Max Amperage: 18 amps
  • Maximum Duty Cycle: 25% @ 100 PSI
  • Compressor Length: 6.5″ (165.1 mm)
  • Compressor Width: 3.5″ (88.9 mm)
  • Compressor Height: 4.5″ (114.3 mm)
  • Compressor Weight: 5.1 lb (2.31 Kg)
Performance Data / Fill Rates
0 2.03 10 0 57.5 10
10 1.17 12 1.0 32.0 13
20 1.11 13 2.0 30.0 14
30 1.04 15 3.0 28.5 16
40 1.01 15 4.0 26.5 16
50 0.97 16 5.0 24.5 17
60 0.92 16 6.0 22.5 17
70 0.88 17 7.0 21.5 18
80 0.83 17 8.0 20.0 18
90 0.79 17 9.0 18.5 18
100 0.76 18 10 17.0 17
110 0.72 18
120 0.67 18

* Supply Voltage: 13.8 Volts

0 to 120 PSI 2 min. 10 sec. (±10 Sec.)
90 to 120 PSI 35 sec. (± 5 Sec.)

* Supply Voltage: 13.8 Volts

Diagrams / Manuals
Refunds, Returns, & Warranty
  • Money-Back Guarantee/Refund Policy
    All merchandise unless otherwise indicated may be returned within 30 days from the shipment arrival date for a refund. A Returned Merchandise Authorization (RMA) number is required for all returns. A 15% restocking fee may apply. Additional deductions may be made to reflect the products current market value. These terms apply to all refunds. Most products are shipped with a refund/replacement guarantee period unless otherwise noted in the product listing. Customers must inform HornBlasters.com of any order discrepancy within 7 days from the invoice date so that we may investigate and resolve the situation accordingly.
  • Warranty
    This product is backed by our One-Year Manufacturer's Defect Warranty!
  • HornBlasters.com Satisfaction Guarantee
    HornBlasters.com offers our customers a 30-day satisfaction replacement or refund guarantee on all purchases, except when otherwise noted in the product listing.
  • Cross-Shipments
    HornBlasters.com will not cross-ship returned merchandise.
  • Physical Damage Policy
    Physical damage to any product purchased at HornBlasters.com will effectively void warranty coverage. Physical damage includes but is not limited to improper handling and/or any other type of damage sustained by irregular usage.



Use this product in a safe and responsible manner, at a distance of at least 100 feet from others.

Proper hearing protection must be worn when using this air horn. Hearing loss or permanent damage may result from unsafe use.

Never operate this product in a closed environment or close to pedestrians or others.

It is the consumer's responsibility to comply with local noise ordinances and D.O.T. sound level laws.


This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.


average rating 5.0 out of 5
Based on 40 reviews
  • 5 Stars
    40 Reviews
  • 4 Stars
    0 Reviews
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
100% of reviewers would recommend this product to a friend
40 Reviews
Rated 5 out of 5
Review posted

Exactly what I was looking for!

Great customer service and amazing product, would recommend to anyone!

Was this helpful?
Rated 5 out of 5
Review posted

Holy Sh&t!

My order came quickly and packaged great. I opened horns and Holy crap they are huge! The compressor is nice and compact. I started the installation and there was some confusion on the length of the supplied air line. I called customer service and they were great and sent out the length I needed no questions asked. I finished installing the kit and the first blow was way louder than I ever expected. The videos don't do this thing any justice. I'm more than pleased with my purchase. If you're thinking of buying a train horn kit. This is the best value hands down!

Was this helpful?
Rated 5 out of 5
Review posted

Great customer service, were more than helpful in the selection of the horn kit

everything worked great, instructions were clear. LOVE THE LOUDNESS!!!!!

Was this helpful?
Rated 5 out of 5
Review posted

Harley truck

Great sounding horn,,loving it...

Was this helpful?
Rated 5 out of 5
Review posted


Such a great quality kit for a good price. Probably more expensive than most but you get what you pay for. The quality of the equipment is great. Would recommend this kit to anyone.

Was this helpful?