That is the PCV intake line from the passenger side rocker arm cover to the air intake on the throttle body. It appears as though you have it connected properly. This needs to be connected. The vacuum flow direction is toward the rocker arm cover. Any dirt is ingested directly into the crankcase. If this line is plugged or restricted, a negative pressure could build in the crankcase and slightly suck in gaskets causing an oil leak. It’s important to check this line regularly; there should be a slight vacuum present while the engine is idling.