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Rocker 127H Air Horn Kit

(Non-Weather Sealed Air Supply)


1 review

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Looking for the loudest air horn kit we sell? You found it! Our Rocker 127H air horn kit was designed to pack enough power to rock your world while being compact enough to fit in most vehicles. Perfect for smaller vehicles where the air source system will be kept in a trunk or a toolbox, you will not find a louder horn kit this compact anywhere else!

Our Rocker air horn that is included in our Rocker 127H is the loudest air horn on the market. Our Rocker air horn consists of two of the four bells of our classic Shocker XL train horns and still packs the same amount of punch. Constructed from an ultra-durable fiberglass-reinforced ABS composite with stainless-steel diaphragms and backed by a limited lifetime warranty against manufacturer defects, our Rocker air horn is not only the loudest air horn you can get but are also some of the most durable.

Powering our Rocker air horn is our 127H air source unit. The 1.5-gallon air tank comes pre-wired and pre-plumbed with a mounted Viair 275c air compressor, providing 3-4 seconds of honk time, and recovers the tank in about 30 seconds! As most of the wiring and plumbing is already done for you, this kit is perfect for beginners or vehicles with limited space. Our Rocker 127H comes as a complete kit with hardware and instructions included.

  • Lightweight & extremely loud
  • Stainless steel internals combined with the fiberglass-reinforced ABS construction ensures these horns are extremely durable through all conditions!
  • Individually mounted horns for flexible installation
  • All-inclusive air horn solution!
  • All standard mounting hardware
  • Max honk time: 3 to 4 seconds

(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... Failure to mount this product as directed will void the warranty)

**Detaching the compressor from the tank will void your warranty on this kit. If you need a solution where the compressor is detached, please look at our 232 and higher models. **

  • Part Number: HK-S2-127H
  • Operating Pressure: 120 PSI
  • Restart Pressure: 90 PSI
  • Voltage: 12-Volt DC
  • Horn: Rocker air horn
  • Material: High-impact fiberglass reinforced ABS
  • Length: Bell #1 14.75" (374.65 mm) Bell #2 12.75" (323.85 mm)
  • Horn Flare: 5"(127 mm)
  • Horn Weight: 2.25 lb (1.02 Kg)
  • Air Source Unit: HornBlasters 127H air source unit
  • Air Source Length: 15.2″ (386.08 mm)
  • Air Source Width: 5.9″ (149.86 mm)
  • Air Source Height: 12.8″ (325.12 mm)
  • Air Source Weight: 13.75 lb (6.24 Kg)
  • Air Tank: 1.5-gallon 4-port air tank
  • Volume: 1.5 gal (6.6 L)
  • Air Source Kit Compressor: 275C air compressor
  • Max Amperage: 18 amps
  • Maximum Duty Cycle: 25% @ 100 PSI
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

  • 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 of any order discrepancy within 7 days from the invoice date so that we may investigate and resolve the situation accordingly.
  • Warranty
    This Kit is backed with a 1 Year Manufactures Defect Warranty!
  • Satisfaction Guarantee offers our customers a 30-day satisfaction replacement or refund guarantee on all purchases, except when otherwise noted in the product listing.
  • Cross-Shipments will not cross-ship returned merchandise.
  • Physical Damage Policy
    Physical damage to any product purchased at 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.

Warnings & Notices

Hearing Loss warning icon
Hearing Protection Required

This product produces extreme loudness. Proper hearing protection must be worn at all times during its operation. Hearing loss or permanent damage may result from unsafe use. Use this product in a safe and responsible manner and at a distance of at least 100 meters from others. Never operate this product in a closed environment, in close proximity to living beings, or where prohibited by law.

Safety warning icon

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

Customer Reviews

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Loud on a budget!

I have had this kit for almost 2 years now. I was skeptical about getting only a half kit, but at the time, I did not have the money to get a shocker kit. When my kit arrived I was absolutely blown away by how loud they truly are! Side by side, they are almost the same loudness as the shocker kit , just a little higher tone than the 4 shocker bells. I liked the compact tank that this kit came with because I was installing it and a 2008 Nissan Pathfinder. I separated the compressor from the tank so that I could mount the compressor inside a storage compartment in the cabin of the vehicle too keep it clear from road debris and water. The 1.5gallon tank is plenty small enough to mount under the rear of the vehicle while still maintaining the spare tire. Installation was a breeze thanks to the instructions and helpful staff who are on call. This kit was worth every $$... It has prevented countless accidents in situations where my factory would have not stood chance. I will never own another vehicle without having HornBlasters on it. These guys are the best in the business and their products and customer service proves that. BUY THESE HORNS!!