Loose cover.Where does this go?

Found this when I opened hood

 

It looks like its a cover for the AC receiver dryer

 

Looks like it has been there for sometime.

Just have the truck in the shop? i just can not see it sitting on the fuse box cover very long.

 

I don't have anything like that on my truck. Looks to me like a tubing plug from a different vehicle. If that's indeed what it is, I wonder how that vehicle is running...

 

I recently had Master and Slave cylinder replaced, then a week later at a different place had 1 inner

Thank you for photo of tank receiver.I was wondering about ac when I saw R1340. The work had nothing to do with AC. Is this a cover for protection?

 

Keeps dirt and moisture out in transit and on the shelf.

Once the Receiver/ Dryer is installed they get thrown away sometimes if you do lots of Ac work you might keep a few caps around to use when swapping lines etc.

 

I've never replaced the drier on my A/C. I wonder if it still works after almost 25 years.

 

Well just how well is your Ac working ?

That might give you some idea.