Approval Details

Valid E.O.


This Executive Order approved the specified parts on on May 15, 1997.
As of Sunday, May 19th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1995 and older model year vehicles EXCEPT those equipped with On-Board Diagnostic II (OBD II) and/ or Enhanced Evaporative Control Systems.Tubing from the PCV valve is connected to a perforated railing that is partially submerged in a solution of dihydroxypropane and purified water. Vapor from the solution enters the engine through the PCV system.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-426
  • Executive Order 426 / D426
  • ARB # D-426
  • Executive Order No: D-426
  • C.A.R.B. No. D-426
  • Resolution D-426
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-426 PDF

D-426 Document:

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