Model#: HITNEC99S

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Hitachi EC99S Portable 4 Gallon Twin Stack Air Compressor

  • Hitachi EC99S Portable 4 Gallon Twin Stack Air Compressor
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Technology is the common thread behind the Hitachi brand. It's what makes Hitachi products superior in design and durability. From its birth, Hitachi has pioneered innovative technologies that have improved lives around the world. This knowledge is shared across all Hitachi divisions worldwide and is incorporated into applications that benefit many different products.
Durability is the bottom line for Hitachi Power Tools. Hitachi sees proof every day with some of their tools coming back for service that were sold 20 years ago! The technology Hitachi incorporates and the determination to produce nothing but the best is evident in the lifespan and longevity of Hitachi's tools.
  • Motor thermal overload protection stops the motor in a possible overheating situation
  • Cast iron, oil-lubricated pump for cooler operation and greater longevity
  • 15 Amp direct drive induction motor delivers efficient and reliable performance
  • Locking regulator ensures the proper pressure is delivered to your tool
  • Industrial air pressure gauges, encased in steel, for higher durability
  • 105 On/135 Off pressure switch for less cycling
  • Universal quick coupler for fast tool changes
  • Lightweight and portable for easy jobsite transport
  • Ball valve drain cock for quick and simple tank draining
  • Portable 4 Gallon Twin Stack Air Compressor - EC99S
  • Synthetic Oil & Dipstick


Weight: 52.9 lbs.
Air Consumption at 90 PSI (SCFM): 3.1
Amperage: 15A
Lubrication: Oil
Motor Type: Induction
Running Horsepower: 2.0 HP
Tank Capacity: 4 Gal.
Tank Orientation: Horizontal
Tank Style: Twin Stack
Voltage: 120V



4.9 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (1)
Easy To Use (1)
Powerful (1)
Value (1)
Heavy (1)
Best Uses
Frequent Use (1)
Heavy Duty Requirements (1)
Large Projects (1)
Small Projects (1)
Excellent compressor
Hitachi has a winner in the Ec99s. This compressor is fast and quiet. It doesn't trip breakers even when both my 12" miter saw and it are running at the same time, but the most impressive thing is noise level or lack thereof.

I own another well known dark green compressor that is sold as a 60 DB quiet compressor. Using a DB meter app standing next to both compressors the quiet compressor measured 68db while the Hitachi measured 70db.

Hitachi really missed the boat by not touting this compressors quietness.

I'm super impressed with everything about it.
December 16, 2016
Originally posted at
Great compressor
I have owned 3 other brands of this type compressor and this one is by far the best. It is quite with fast recovery.
June 1, 2016
Originally posted at
Great Product!
Great product straight out of the box! I've used this compressor with all types of Hitachi nail guns and the performance has been flawless. Highly recommend this product.
June 1, 2016
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Best Uses
Frequent Use
Heavy Duty Requirements
Large Projects
Small Projects
Home Repair
Great little compressor
Does everything I want it to. Even though it is heavy that indicates the quality of the compressor. It would be nice if rollers could be attached somehow.
February 4, 2017
4 months ago
Describe Yourself:
Avid Do-it-Yourselfer
the compressor is much faster an quieter than expected
Great compressor for any contractor ! Can run all my nail guns with ease!
July 23, 2016
Originally posted at
really fine small compressor
Fast acting small compressor great for home use I like it
August 11, 2016
Originally posted at
Excellent Reliability
Impressed with it's overall quality and reliability. Quick recovery, holds pressure, and very transportable. Excellent compressor to support one or two carpenters.
December 1, 2016
Originally posted at
Needs to be mobile
It works pretty good, but needs some kind of rollers on it , in the event it needs to be moved from time to time.
August 28, 2016
Originally posted at

Questions & Answers

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Browse 2 questions Browse 2 questions and 5 answers
What type of oil does it use,?
A shopper on Feb 4, 2017
BEST ANSWER: The unit I ordered came with a bottle of synthetic oil. I will follow the owners manual recomendations when it is time to change.
where can I buy parts
David on Jul 28, 2016
BEST ANSWER: Please contact Hitachi directly at 800-706-7337 for parts