Those are the cam profile solenoids.
The "tube " is the retaining bolt.
Shop manual description:
The CPS solenoids control the supply of engine oil pressure to the locking pins in the switchable tappets, to switch the tappets between the two cam profiles. A CPS solenoid is installed on the rear...
The cannister can be rotated to access the retaining bolts on the leak detection pump.
To remove the cannister, the body will have to be lifted up off the frame a couple inches.
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