What is this?

[DA VINCI]

This plastic part is located on the right and bottom of the engine bay. A small pipe is conected to it. What is it? The car is a '92 965.

[Jim2]

Vacuum accumulator. A reservoir which preserves intake manifold vaccum while the engine is running at atmospheric or on-boost, so that heating and ventilation controls remain working. The heat and vent controls function on engine vacuum.