What does "oil leg" mean? I can't undestand the meaning of "leg" in this phrase.
What would it be the best translation?
Here is a phrase where it is used: water flows from the oil leg of the vessel

Question

What does "oil leg" mean? I can't undestand the meaning of "leg" in this phrase.
What would it be the best translation? 
Here is a phrase where it is used: water flows from the oil leg of the vessel

Answer

"Oil leg" is a very specific technical term. It refers to a pipe designed to carry oil. You will never hear this term used outside of oil and gas companies.

Look for the term "water leg" on this page, and you'll see a picture that shows you the kind of device it might be attached to: https://greasebook.com/blog/water-systems/

Answer

https://petrowiki.org/Gas_cap_drive_reservoirs

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