LOL at iRide that's a good one.
The accessory is for the vacuum control of HVAC functions. Aka it runs over to the passenger fender, across the front bumper and into a vacuum canister (for storage when in boost/low vacuum etc).
The rubber elbow you see is correct. That's the third nipple for the vent located on the switch. If you follow your lines like they are outlined in the diagram and look at the purge valve, you'll see one side is labeled "CAN" for the charcoal canister. That side goes to the purge switch and continues on to the canister.
