I found a small container on the side of the radiator of my plus 2 (S130/5), but I haven’t got a clue about the function. Can anybody please inform me what it is? (have a look at the photo) It has a cork cap
Hi
No photo added?
Give it another go, if you try to add a big photo it will not work. Resize the pic and you are good to go.
Jason
Overflow bottle?
John 
Is it connected to anything?
…and if you take the cork out is there anything inside?
Is it a coffee-maker 
Doesn’t look like a Lotus part - perhaps it’s a Triumph thing that goes with a Triumph radiator installation?? 
Matthew
It is empty, and triangular, pointing to the ground.
Is this not the original radiator?