Front engine vacuum fitting usage

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Joined
Aug 29, 2016
Messages
593
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Location
Milford, MI
My Car
1971 Mustang Mach 1 429
1972 Mustang Convertible 302


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Can someone tell me what is attached to the vacuum fitting that is located on the front of the engine?  Right now one of the lines going to a T which goes to my distributor as well as the device on top of my thermostat housing are attached to thos.

 
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