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It’s the Fetzer valve serves absolutely no purpose what so ever and cost $300 dollars to buy and $500 in labor to replace.

Sorry I just couldn’t resist, I was kidding.

I have never seen what you are talking about and have been working on vehicles for almost 40 years.

I even went out just now and looked under our 94 Burb that has got to have the stupidest antilock brake system I have ever worked on, just to be sure.

My only suggestion would be to call a dealers parts department and see what they have to say.
 
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