Mystery tube to where?

[gidders225]

2000 chevy tahoe with 5.3 motor

At the rear of the motor, on the passenger side is a metal tube that has a rubber cap. Is this normal on all tahoes or did a mechanic do bad work on my truck? If it does go somewhere please provide a photo if its in between a bunch of other tubes.

In the 1st photo I'm trying to point a screwdriver at the tube. In the second you get a better shot at the cap. You can see the clamp holding it on. It really doesn't look factory.

Thanks in advance for any help.

 

[tree369]

If it ever stops raining I will go out and take a look...I also have a 2000 NBS w/ 5.3

 

[gidders225]

thanks tree369

 

[tree369]

Her gidders I checked today and do not see that tube on the pass side rear near the firewall...do you know where it comes from so I can try and back-trace it to see if I have it on mine?