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Old 05-29-2015, 03:30 PM   #3
BLT gmc
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Join Date: Feb 2014
Location: West Iowa
Posts: 1,106
Re: 2-way radiator caps?

I think what you are looking for is a "closed system cap". Available at any good parts store. The caps are easily identified because they have two rubber gaskets. One at the bottom of the neck and the other at the top of the neck. This will isolate the overflow. Bruce
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