You actually have to give the tubing a tug in order for oxygen to begin flowing.
From the dailyherald.com
Steamy, they arrive with a bowl of the house marinara, ready for a tug and dunk.
From the tennessean.com
A blur of half-smiles, he absentmindedly chews his fingers and tug at his cuffs.
From the guardian.co.uk
The Calder did not drag out the adagios, and it did not tug at the heartstrings.
From the latimes.com
A tug on an exposed electrical cord uproots a lamp that had been in our kitchen.
From the washingtontimes.com
French maritime services company Bourbon says it owns the tug that was attacked.
From the al.com
Does your grade on a college term paper still tug at you years or decades later?
From the latimes.com
Tug and Tanner spend much of the day joined by a 2-foot length of nylon webbing.
From the kentucky.com
There are, after all, a lot of other debtors around who may tug at our sympathy.
From the independent.co.uk
More examples
A sudden abrupt pull
Pull hard; "The prisoner tugged at the chains"; "This movie tugs at the heart strings"
Strive and make an effort to reach a goal; "She tugged for years to make a decent living"; "We have to push a little to make the deadline!"; "She is driving away at her doctoral thesis"
Tugboat: a powerful small boat designed to pull or push larger ships
Tow (a vessel) with a tug; "The tugboat tugged the freighter into the harbor"
Lug: carry with difficulty; "You'll have to lug this suitcase"
A tugboat (tug) is a boat that maneuvers vessels by pushing or towing them. Tugs move vessels that either should not move themselves, such as ships in a crowded harbor or a narrow canal, or those that cannot move themselves alone, such as barges, disabled ships, or oil platforms. ...
In physics, tug is sometimes used to denote the derivative of yank with respect to time or mass multiplied by jounce. In relativistic physics, it is expressed as the third derivative of momentum with respect to time, because the mass is velocity dependent. ...