Model#: HITNEC99S

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 120 day money back guarantee
Open Box
New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Hitachi EC99S Portable 4 Gallon Twin Stack Air Compressor

  • Hitachi EC99S Portable 4 Gallon Twin Stack Air Compressor
(See Price in Cart)
Free Shipping
(continental U.S.)
In Stock
Ships Today


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
Compliance and Restrictions
warning: --


Weight: 52.9 lbs.
Air Consumption at 90 PSI (SCFM): 3.1
CSA Safety: No
Drive System: Direct Drive
ETL Safety: No
Lubrication System: Oil-Lube
Motor Type: Brushed
Operating Pressure (PSI): 135
Powered Tool Power Source: Electric - Corded
Pump Type: Reciprocating
Running Horsepower: 2
Tank Capacity: 4 gal
Tank Construction: Cast Iron
Tank Orientation: Horizontal
Tank Style: Twin Stack
UL Safety: No



4.4 / 5.0
28 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (6)
No, I would not recommend this to a friend (2)
Value (7)
Easy To Use (6)
Lightweight (5)
Powerful (3)
Not Durable (1)
Heavy (1)
Best Uses
Small Projects (6)
Home Repair (5)
Jobsite (3)
Frequent Use (2)
Great little compressor.
This is a perfect little compressor for my shop in the basement. Plenty of power for all of the tasks it was intended for thus far.
September 9, 2018
Originally posted at
Great little compressor
Light,fast recovery and very quiet, would buy again
July 27, 2018
Originally posted at
Good quiet performance
So far so good. Switch cover was broken on arrival, promptly replaced by Hitachi. Not quite enough oil in package to fill compressor. Works well with air tools. Fairly quiet.
July 15, 2018
Originally posted at
works good so far
need to put in the service manual how many ounces of oil is need for the compressor!!
May 31, 2018
Originally posted at
plenty of power
love it, user friendly, does everything I need it for with plenty of power
April 30, 2018
Originally posted at
A very good product.
I use this compressor alot, on all my residential roofing. I'm pretty rough on my tools, but this compressor never fails, and is very durable. For the price you can make back your money tenfold.
March 29, 2018
Originally posted at
Pleased with the overall performance
I have had several 'pancake' compressors but none held up to the tasks. I see this compressor on many job sites and all I talk to are happy.
February 26, 2018
Originally posted at
Love the Hitachi brand, keep it up
Performance for home use, two thumbs up great ,and Quality.
February 17, 2018
Originally posted at
Product performs as advertised - have not used it long enough to comment on long-term durability
On/Off switch seems to be quite hard to pull on. Compressor was quite a bit louder than the Campbell-Hausfeld compressor I replaced it with.
February 14, 2018
Originally posted at
Good Compressor
I do not Like at all the Oil dip stick - Very hard to see the oil level , when you pull the plastic dipstick up it has to be tilted to miss another compressor Part . looks like a one size fits all Dip stick - Very poor design in my opinion! this is why the average Rating .
September 22, 2017
Originally posted at

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 7 questions Browse 7 questions and 12 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

New Vs. Reconditioned

What's the difference between New and Factory-Reconditioned?

Factory-Reconditioned products have been returned to the manufacturer and are restored to like-new operating condition; they go through a rigorous testing and inspection process. Plus, they offer a significant savings vs. new.
  • Reconditioned products may have minor cosmetic blemishes or scratches that do not affect item performance.
  • Reconditioned products may not come with all of the consumables the new version comes with (bits, sanding pads/papers, cases, etc.).
  • Both come with a manufacturer warranty and are covered by our Money Back Guarantee; New is 30 days, Reconditioned is 120 days.
Condition: New Factory Reconditioned
Features: Same Same
Specs: Same Same
Includes: Portable 4 Gallon Twin Stack Air Compressor - EC99S,
Synthetic Oil & Dipstick
Portable 4 Gallon Twin Stack Air Compressor - EC99S,
Synthetic Oil & Dipstick
Availability: In Stock In Stock
Warranty: 1 Year null