I've searched around a little on this and found different answers, but what is that middle port for on the vacuum tree that goes on top of the supercharger? Does it need to be capped off? I replaced this thing after one of the ports broke (the one that has a hose that connects to the bypass valve actuator), and I can't remember if that middle port was blocked off or not. Seems like a lot of pictures I'm looking at show some kind of cap on it, but I don't remember there being one on my old one.