Automatic Air Release Valves

release valves
(Release Valve) Located on the Shaft, this device allows smoke to escape from the chamber by blowing into the Hose. This device also ensures that water does not travel up the Shaft into the Bowl.
(Release valve) Gas lifejackets have a release valve usually found inside the top of the oral inflation tube.

automatic
(of a firearm) Self-loading and able to fire continuously until the ammunition is exhausted or the pressure on the trigger is released
(of a motor vehicle or its transmission) Using gears that shift by themselves according to speed and acceleration
operating with minimal human intervention; independent of external control; "automatic transmission"; "a budget deficit that caused automatic spending cuts"
automatic rifle: light machine gun
automatic pistol: a pistol that will keep firing until the ammunition is gone or the trigger is released
(of a device or process) Working by itself with little or no direct human control

air
This substance regarded as necessary for breathing
a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of; "air pollution"; "a smell of chemicals in the air"; "open a window and let in some air"; "I need some fresh air"
The free or unconfined space above the surface of the earth
The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen
air out: expose to fresh air; "aerate your old sneakers"
be broadcast; "This show will air Saturdays at 2 P.M."