This plug replaces the factory crankcase vent oil return nipple on all LML Duramax front engine covers. These plugs are perfect for highly modified builds that have altered PCV systems and/or engine re-powers or swaps. This billet plug comes with the required o-ring and new bolt to replace the tamper proof bolt that comes in the cover from factory. This plug can help simplify your engine compartment and eliminate unneeded plumbing related to the LML PCV system.
Note: If your using a stock LML valve cover that has an oil separator you will need to return the oil to the engine somewhere. This plug is primarily used to allow the use of a LML front cover and oil pump on a 2001-2010 engine. OR LML Engines utilizing billet valve covers.
Eliminates GM Oil Separator PCV Drain Pipe # 12657323.
Replacement O-Ring GM # 12625154.
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