On the small vacuum lines under the hood, I normally see a clear/yellowed plastic T. I have now run across these brass tees on a third car. One was a big block, the second a base motor car, and now on an LT-1. I have attached pictures of the plastic that I am used to seeing and the brass. Why the difference? If I am reading my AIM correctly, the hoses came to the line assembled. Is this an example of different tees (hose bundles) from different suppliers?



70-72 underhood vacuum Tees
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