TH350 Vacuum tube ??

Okay, First off Hi! I'm the new guy :) Secondly I stumbled upon this site while trying to find out what a Tranny part is called. I just rebuilt my 350 motor for my Camaro. I just backed the car into the garage, went inside, came back out to jack it up and check all the oil pan screws for tightness on the fresh rebuild (would hate to have loose bolts and get oil all over that pretty rebuild after all). To my distress I see a rather large and growing larger by the second puddle of my precious B&M fluid all over the garage floor. After getting it in the air, I have discovered that the connector on the modulator side where the vacuum tube goes into the transmission housing; is busted / torn. what is this part called ? I'm not very good with the intricacies of transmissions so I am clueless on this. Ive looked at cutaways and cannot seem to figure out what the heck it is at all. Any help would be greatly appreciated. Go figure I get the engine rebuilt and something else prevents me from enjoying a test drive.:CRY:

Quick update to say I am a moron. It was the kickdown cable shaft. It snapped , causing the fluid to pour out around it. I thought it was the tube just because thats what wiggled when I pulled. So aside from that I feel like a complete buffoon lol