air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time

a breathing apparatus that allows the swimmer to breathe underwater

a breathing tube that allows a swimmer who is swimming along the surface of the water to breathe normally, even though the swimmer's face is just below the surface, peering down into the water

Sheaffer's pen model that had a filling tube that the user would extend from the feed in order to fill the pen.

A plastic tube that extends above the surface of water and allows a swimmer to breathe air while swimming.

Breathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface - allows swimmer to breathe while face down in the water.

Tube enabling a person to breathe underwater.

A tube which you can breathe through when floating face-down on the water surface.

A snorkel (also spelled "schnorkel" or "schnorchel") is a tube that allows a person, vehicle, or vessel to draw air while submerged under water. A snorkel can also refer to a special type of fire apparatus.