I threw it out a long time ago and can't remember quite what it was, but I believe a rubber hose ran from the port on top of the fuel reguatlor to the upper port on the intake T-junction. Here are some pics of where a sperate line runs from regulator and intake to the nitrous NMU to help understand (thumb is on intake port and pointer finger on regulator port):
My question to all is, can I order a stock replacement hose to connect these two ports? I believe that'* how it was...been a long time.
Otherwise no biggie, I'll make my own.