der Heber
jack
A device for lifting heavy loads, especially a car jack for a car.
Er benutzte einen hydraulischen Heber, um das Auto für den Reifenwechsel anzuheben.
He used a hydraulic jack to lift the car for the tire change.

jack / siphon / lifter
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jack
A device for lifting heavy loads, especially a car jack for a car.
Er benutzte einen hydraulischen Heber, um das Auto für den Reifenwechsel anzuheben.
He used a hydraulic jack to lift the car for the tire change.

All meanings of 'der Heber' derive from the verb 'heben' (to lift). A 'Heber' is therefore always a person or a tool that lifts or moves something.
Kannst du mir helfen, diese schwere Kiste zu heben?
Can you help me lift this heavy box?
When cars, tire changes, or heavy loads are mentioned, the word usually refers to a car jack or a hydraulic jack. A typical compound is 'der Wagenheber' (car jack).
Ohne einen Heber kannst du das Rad am Auto nicht wechseln.
Without a jack, you can't change the wheel on the car.
In contexts involving liquids, hoses, aquariums, or barrels, it refers to a siphon. The point is to move a liquid from one container into another.
Er hat mit einem einfachen Heber das Benzin aus dem Kanister in den Tank gefüllt.
He used a simple siphon to fill the gasoline from the canister into the tank.
When the context is sports, competitions, weights, or kilogram measurements, it refers to a person, namely a weightlifter.
Der deutsche Heber gewann die Silbermedaille.
The German lifter won the silver medal.
This special meaning can be recognized from context: when winemakers, wine barrels, or wine tastings are mentioned, it refers to the glass device used to take a sample.
Der Kellermeister entnahm mit einem gläsernen Heber eine Probe direkt aus dem Barriquefass.
The cellar master took a sample directly from the barrique barrel with a glass wine thief.