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Viair 400C Air Compressor

(Fast Fill – 150 PSI / 2.62 CFM)


6 reviews

Add Viair Air Compressor Bracket Tooltip
The Viair Air Compressor Bracket will allow you to mount your compressor upright and is compatible with Viair Compressor models 275C-485C.
Add Cooling Fan Isolator Kit Tooltip
Isolate your Compressor, drastically cutting down on vibration, allowing your compressor to run quieter & cooler, & extending the duty cycle up you 25%!


Looking for one of the fastest compressors you can buy? Check out the speed demon Viair 400C Air Compressor, the fastest-filling compressor in its class, and the centerpiece in many of our best train horn kits. This compressor produces a stunning 2.62 CFM while pulling no more than 28 amps of power, giving you a lighting-fast recharge time. The Viair 400C can recharge a 2.5-gallon tank from 110-150 PSI in a ridiculously fast 48 seconds and recharge a 5-gallon tank in just over 1 minute and 40 seconds. With speeds this fast, this is the go-to compressor for train horns and air horns, but it also has the ability to do some light tire inflation in case of emergency. 

The Viair 400C comes complete with a remote mountable intake filter assembly, or “Air Filter Snorkel Kit”, allowing you to relocate the air filter up to 6 feet away to keep it away from moisture and debris. It also includes a standard 1/4″ NPT stainless steel braided leader hose with check valve and insulated wiring for fast installation. 

The Viair 400C Air Compressor is featured in the Horn Kits listed below:

Conductor's Special 240 Conductor's Special 540
Nathan Airchime K3 540 Nathan Airchime K5LA 540
Nathan Airchime K5HA 540 Nathan Airchime P3 540
Nathan Airchime P5 540 King 5 540
King 6 540 Katrina 540
Admiral 540 - HornAir 540

This compressor does come with the option to add our 40 Amp Air Compressor Wiring Kit to it as well!

Note: Use thread sealant for proper installation. Thread tape is not recommended. Properly sealed, recommended torque for 1/8″ is 10 ~ 11 ft. lbs. Recommended torque for 1/4″ and 3/8″ is 12 ~ 15 ft. lbs.

0 2.62 16 0 74.0 16
10 2.39 18 1.0 65.0 20
20 2.21 20 2.0 60.0 23
30 2.11 22 3.0 56.0 25
40 2.01 24 4.0 53.0 27
50 1.93 25 5.0 49.0 28
60 1.84 26 6.0 46.0 28
70 1.73 27 7.0 42.0 28
80 1.65 27 8.0 38.0 28
90 1.52 27 9.0 35.0 27
100 1.45 27 10.0 31.0 27
110 1.35 27
120 1.26 27
130 1.19 27
140 1.08 27
150 1.01 26

 * Supply Voltage: 13.8 Volts

0 to 105 PSI 1 min. 27 sec. (± 05 sec.)
85 to 105 PSI 21 sec. (± 03 sec.)
0 to 145 PSI 2 min. 20 sec. (± 05 sec.)
110 to 145 PSI 48 sec. (± 03 sec.)
0 to 105 PSI 2 min. 55 sec. (± 10 sec.)
85 to 105 PSI 45 sec. (± 05 sec.)
0 to 145 PSI 4 min. 50 sec. (± 10 sec.)
110 to 145 PSI 1 min. 40 sec. (± 05 sec.)

* Supply Voltage: 13.8 Volts

  • Permanent Magnetic Motor
  • Oil-less Design
  • High-Performance PTFE Piston Ring
  • Stainless Steel Valves
  • Moisture & Dirt Resistant 
  • Gearless Direct Drive Motor
  • Anodized Aluminum Alloy Cylinder
  • Automatic Reset Thermal Overload Protector
  • Mounting Plates with Vibration Isolators
  • Stainless Steel 1/4" Braided Leader Hose
  • Remote Mountable Intake Filter Assembly
  • Insulated Wiring with Connectors
  • Viair 400c Air Compressor
  • 1/4" NPT Braided Leader Hose & Check Valve
  • Remote Mountable Two-Stage Air Filter
  • Replacement Filter Elements
  • 1 Year Manufactures Defect Warranty
  • Mounting Hardware
  • Part Number: AC-400C, AC-400K
  • Manufacturers Part Number: 40040, 40048
  • Voltage: 12 Volts DC
  • Max Amperage: 28 Amps
  • Maximum Duty Cycle: 33% @ 100 PSI
  • Maximum Pressure: 150 PSI
  • Max Tank Size: 5 Gallons
  • CFM @ 0 PSI: 2.62 CFM
  • Length: 9″ (228.6 mm)
  • Width: 4″ (101.6 mm)
  • Height: 6.75″ (171.5 mm)
  • Weight: 6.95 lb (3.15 Kg)
  • 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 product 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

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

5.0 Based on 6 Reviews
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Filter Reviews:
Kendrick B.
United States United States

Jeep JKU kit

My first train/air horn ever. I did a lot of research on my own and was very torn between companies. I looked at reviews and YouTube videos to come to my conclusion. I was very hesitant to spend the “extra” money on the more expensive option but I chose to buy quality in my mind, AND BOY I’M GLAD I DID!!! I purchased the JKU Wrango kit for my Jeep Wrangler. This kit comes with 2 horns, a 2 gallon tank and a Viair air compressor with all the wiring, tubing, and connections needed. The instructions and pictures where a little confusing at first, but after laying it all out and seeing it as I was reading it made a difference. Easy install to say the least and VERY helpful customer service! Now this is where quality comes in. My buddy bought the “other” brand and we did a comparison. HOLY ****!!!! My horns blew his out of the neighborhood. It’s so loud it’s ridiculous, I’m not even kidding! I’m so glad I went with the HornBlaster brand! I’m about to buy another one for my wife’s Jeep because she love it too!!! It’s so much fun to have and the reactions you get are priceless! If you are in the market and have even though about getting a louder horn you have to get one of these!!! Mind you, I only have 2 trumpets and they sell 5 or 6 trumpets, HOLY ****!!! It’s a win win for me and I highly recommend it!

Fritz L.
United States United States

New Compressor

Have not installed yet, however the customer service was outstanding!

Kevin C.
United States United States


Quick recover time and quiet . Easy install

Caleb S.
United States United States

Heck Yeah!

My original compressor was 5 or so years old and it decided to quit working It lives a rough life underneath the truck. I got on Hornblasters website did some research and even contacted Hornblasters about some questions. i was emailed back by the end of the day and this locked in my decision. Ordered the new compressor. it was at my house in 3 days. Installed the compressor on the truck and it worked great.


Best price and fastest shipping

Purchased the Viair 400C in stealth black to replace my old worn out Viair 400C. I swear this compressor is faster and a **** of a lot quieter than my original one.

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