One of the parts left over looks like a boost elbow? It doesn't list it in the manual so I'm assuming its not? I may be wrong because I glanced at it a week ago almost but I could have swore it looked like a boost elbow. Any input is appreciated. Sorry if this is a dumb newbie question.

 

it replaces your old one. it has bigger port more accurate. Should specify in the instructions

 

Whoops I just looked and your right it does say, guess I missed that step