Approval Details

Valid E.O.


This Executive Order approved the specified parts on on April 16, 2013.
As of Thursday, July 25th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
HH2 Hydrogen Generator1900-2000 model year light/medium/heavy heavy-duty on-road gasoline and diesel engines up to 20.0 liters.Vinyl hose from device is inserted into opening of air intake housing.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-704-1
  • Executive Order 704-1 / D704-1
  • ARB # D-704-1
  • Executive Order No: D-704-1
  • C.A.R.B. No. D-704-1
  • Resolution D-704-1
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-704-1 PDF

D-704-1 Document:

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