Identification of part t25 engine compartment

[leeips]

Hi everyone. Upon taking the fuel tank out to replace it, i noticed a line, running along the chassis from the front end under the dash to the rear engine compartment, to the pictured component.  At first i thought it was brake line or something as it looked corroded, but then saw it joined to plastic pipe on both ends.  For the life of me i cant see what the part is it services?  I assume as it leads to the dash area, it may be a sensor of speed/pressure/acceleration, sensor gauge??
Please educate me accordingly. 

[davidoft1]

If you’re referring to that rusty thing in the middle of the picture it’s the clutch slave

[mioba]

Guess the clutch has never been bled by the looks of it.
Time for a new cylinder.
Horrible job to do.
Those plastic lines are actually clear.

Get some waxoly in there.

[nicktennear]

I've just done my slave cylinder and it was ok if you do it all in the right order. Smaller hands would have been useful though.

[mioba]

Yea its just very fiddly.
Done mine last summer and getting the bolts was a PITA.

Looking at the OP he needs that cleaned up an plus gassed before any spanner is let near it.

[leeips]

Thats great thanks.