a metal tube array cointaing coolant and vacuum lines. The coolant one is the larger of the 2. The hose from the canister goes to just behind the DS TB. Thd tube array passes under the plenum and exits near the IACV. Another short hose connects to the balsnce tube. If you have removed the metal tube array because you are deleting the TB coolant circulation, then you can go directly to the balance tube.