air chamber

a cavity or compartment full of air, esp. one used in hydraulics to equalize the flow of a fluid

See air chamber in American Heritage Dictionary 4

noun
  1. An enclosure filled with air for a special purpose.
  2. A chamber, especially in a hydraulic system, in which air elastically compresses and expands to regulate the flow of a fluid.

Learn more about air chamber

link/cite print suggestion box