(Release valve) Gas lifejackets have a release valve usually found inside the top of the oral inflation tube.
(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.
Association of Public-Safety Communications Officials
After Anderson-Prichard purchased Kanotex in '52, they rebranded both their own and Kanotex's gas as "Apco" (from the initials of their name, of course). Apco marketed in the Midwest. In 1978, Apco was purchased by Total, and while a few Apco stations survive (c.
The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen
This substance regarded as necessary for breathing
be broadcast; "This show will air Saturdays at 2 P.M."
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
air out: expose to fresh air; "aerate your old sneakers"
Black Canyon
The Black Canyon partially framed at the top by an incomplete bridge. The circles on the building to the left are matched on the right bank - they're high pressure release valves.