boost selenoid question

wondering what the nipple is on the boost selenoid with nothing attached to it, I know one vacuum line goes from the boost selenoid to the wastegate actuator, and another goes from the selenoid to the turbo. I am just curious as to what the extra nipple thingy is for on the end of the selenoid under the vacuum line. Thanks in advance!
 

Flyin Ryan

hated cuz he drives fords
Re: boost selenoid question

It's suppose to be left open with nothing hooked up to it. Originally came with a cheesy little filter on it that I don't think lasted long because i've never actually seen a truck in person with one on there.
 
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