HornAir 5OB2 Fast-Fill Onboard Air System

Honking & Moderate Pneumatic Use


2 reviews

Suggested Addons
Add Tire Inflation Kit Tooltip
Our Tire Inflation Kit includes a 30' Coil Hose, Tire Inflation Gun, Air Relocation Kit, Blow Gun, & a complete Air Accessory Fitting Kit!
Add 220 PSI Digital Pressure Gauge Tooltip
Using a tank mounted sensor wired directly to your gauge, our 220-PSI rated Digital Air Pressure Gauge delivers unparalleled accuracy with microprocessor stabilized readings.
Add Gold Extended Warranty Tooltip
1 year add-on to existing warranty. Does NOT cover accidental damage, no advanced replacement.
Click here for more information!
+See price at checkout
Add Platinum Extended Warranty Tooltip
2 year add-on to existing warranty. DOES cover accidental damage and advance replacement.
Click here for more information!
+See price at checkout


This onboard air kit is not to be underestimated. Designed for anyone that wants their air and wants it now, the HornAir 2OB2 brings you a complete 150 PSI onboard air system with the fastest filling compressor in its class

Powering our HornAir 2OB2 is Air Zenith's speed demon of a compressor, the Air Zenith OB2. As one of the fastest compressors in its class, the Air Zenith OB2 can recharge our 5-gallon tank in as little as 70 seconds while only pulling 35 amps!

This package is perfect for filling up load-leveling air springs. If your truck has air springs without a compressor setup, this is the perfect compliment. 5 gallons is also enough capacity to give you plenty of onboard air in case of a road emergency that requires you to inflate a tire, or to use for air tools for example. Please note that if you use horns, you will still need an air valve kit to connect the system properly. 

While the Horn Air 2OB2 is a complete onboard air system that provides you with everything you need to get up and going, be sure to add on a wireless remote, tire inflation kit, or an electric drain valve kit to get the most out of one of the best onboard kits you can buy!

Our HornAir systems come complete with all necessary fittings, including a Viair 110/150 pressure switch with a built-in relay, safety blow-off, air gauge, and drain cock. Unlike many other onboard air systems, ours comes with 10 and 18 gauge wire, as well as a complete wiring kit including a fuse holder. This takes out the guesswork and helps ensure your system is installed correctly. All of our kits are also backed by a year manufacturer's warranty as well as lifetime tech support!


Shocker S4 train horns (part number: AH-S4)
- Outlaw train horns (part number AH-C3B) 
Nathan Airchime series train horns (part number: AH-P3, AH-P5, AH-K3, AH-K5)

  • Designed for extreme train horns
  • All-inclusive train horn air solution!
  • Top-end 150 PSI compressor perfect for train horns
  • Comes with a standard 1/2" push-to-pull fitting
  • Complete fitting kit with safety valve & drain cock
  • All standard mounting hardware
  • Air Tank: HornAir 5 gallon tank
  • Tank Length: 20.5" (520.7 mm)
  • Tank Diameter: 9.5" (241.3 mm)
  • Tank Height (With Legs): 11.5" (292.1 mm)
  • Tank Weight: 20 lb (9.07 Kg)
  • Operating Pressure: 150 PSI
  • Restart Pressure: 110 PSI
  • Air Compressor: Air Zenith OB2 air compressor
  • Average Fill Time: 1 Min 10 Sec
  • Voltage: 12 volts DC
  • Air Flow: 4.25 CFM at free flow
  • Max Amperage: 35 amps
  • Maximum Duty Cycle: 100% @ 200 PSI
  • Compressor Length: 13.0″ (330.2 mm)
  • Compressor Width: 6.0″ (152.4 mm)
  • Compressor Height: 7.50″ (190.5 mm)

5-Gallon Air Tank Dimensional Drawing

  • 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.

Warnings & Notices

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 www.p65warnings.ca.gov.

Customer Reviews

5.0 Based on 2 Reviews
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Great setup!

Using it on my Square Tag K5LA, works great!!!


Great setup!

Using it on my Square Tag K5LA, works great!!!