Approval Details

Valid E.O.


This Executive Order approved the specified parts on on February 10, 2003.
As of Friday, June 21st, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1996-2002 model-year 3.9, 5.9, and 8.3 liter Case off-road compression-ignition engines. This exemption is limited to engines subject to California's Tier-1 exhaust emisison standards. This exemption is also limited to engines used in port equipment such as yard tractor, lift truck, top pick, side pick, and a gantry crane.The AZ Purifier and AZ Purimuffler can be installed on engines operated using standard California diesel, ultra-low sulfur diesel, or PuriNOx water emulsion fuel based on either standard California diesel or ultra-low sulfur diesel.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-420U-1
  • Executive Order 420U-1 / D420U-1
  • ARB # D-420U-1
  • Executive Order No: D-420U-1
  • C.A.R.B. No. D-420U-1
  • Resolution D-420U-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-420U-1 PDF

D-420U-1 Document:

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