What is this supposed to be plugged into

Maintenance/Repairs
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1

2007 Pontiac Grand Prix gt 3.8
Doing spark plugs and noticed this wasn’t plugged in. The one right next to it is plugged into a hose but there is nothing I can find that this should go into

IMG_20200208_163124894
IMG_20200208_1631248943072×4096 2.94 MB

2

IMG_20200208_163134028
IMG_20200208_1631340283072×4096 3.2 MB

3

The one with the hose is the MAP Sensor.
The one without the hose is the Barometric Pressure (BARO) Sensor. It doesn’t get a hose. It’s just open to the atmosphere.