Could someone identify this part please?

[MossRoad]

Check out this video about 1:35 into the video.
https://www.youtube.com/watch?v=sZMGvFPMYjQ

 

[Coonhound1]

I watched the video and, no, it is not the horn. The horn button is on the lower right of the dash. This part is on the lower left. The knob unscrews and pulls out about 1/2" on a copper stem. It looks like every wire under the dash runs to it. I saw a pic of another identical tractor that had this part removed. My tractor is a D1600 II.

 

[almaryholm]

Would guess knob is to hold cover over FUSE block ( seems to me all the wires behind would give it away)

 

[Coonhound1]

Wow. Why didn't I think of that? Thank you very much and please don't throw things at the newbie for asking such a question.

Here is a better one: where can I find a lower radiator hose for it? D1600 II

 

[PILOON]

On my MT180D that is the fuse box location and the knob is what holds the cover in place.

The video posted is very similar to the MT180D suggesting that the basic models are pretty close in design.
My factory manual includes many little variances in order to comply with different country regulations but always the basics remain same.