The pump on #3018 has a steel pipe running from the manifold T to the right hand port, looking at pump from front of engine, that has an integral 1/4" pipe, connected with a short rubber tube. the other port, just to the left, is a hole, with a loose fitting 1/4" pipe just inserted into hole with no resistance to keep it there. It proceeds down and under engine to connect to T and leads to frame tube. Curious as to what held tube in place 68 years ago. I'll epoxy mine. I'm guessing this 2nd port is a booster for vacuum under load but would it negatively affect any of the other dependent systems in line except for wiper speed if it was eliminated? I'm 3 months in on this fascinating/frustrating project and try to learn and understand something every day. The forum posts are a true gift! thank you.