I can't see the pic (work computer) but guessing maybe you're talking about the one for the vacuum modulator. The only vac line that goes to the transmission is this one. It runs from the vacuum tree on the upper manifold, to a metal tube which has a bracket bolted to the manifold, down to the passenger side of the trans where the metal tube turns to a rubber tube, which attaches to the nipple on the vacuum modulator on the passenger side of the trans. It is tough to access from underneath but you can easily access the modulator through the access panel in the floor.