The phrase "a pair of tubes" is correct and usable in written English.
It can be used when referring to two tubes that are considered together as a unit or set.
Example: "The scientist used a pair of tubes to conduct the experiment, ensuring that each tube contained a different solution."
Alternatives: "two tubes" or "a couple of tubes".
Wolffian duct, also called Archinephric Duct, one of a pair of tubes that carry urine from primitive or embryonic kidneys to the exterior or to a primitive bladder.
It is channeled in a pair of tubes straight through the lungs and into the system of air sacs and hollow bones.
The female reproductive tract consists of a pair of tubes (gonoducts) extending from anterior, funnel-like openings (ostia) to the cloaca, except as noted below.
The oxygen tank that accompanies Mr. Sumlin everywhere these days, even onstage, whirred softly on the carpeted floor beside him, and a pair of tubes attached to it were hitched up to his nose.
Running from the condensing unit and into the house, Mr. Bellini said, are a pair of tubes that circulate coolant to the part of the system known as the evaporator coil, which is typically placed in retrofit situations in the attic.
On each train, there are a pair of tubes that allow the water to be shot into the air as the train reaches the bottom of the first drop.
The photo of V. I. Prewett, the founder of Prewett Mills, shows a gray-haired man holding a pair of tube socks.
Some days, the boys actually spend money on a new mitt or a pair of tube socks.
In response to a predator direct attack, aphids secrete cornicle droplets from a pair of tube-like structures on the abdomen called siphunculi [4] [6].
Jensen and Zwieniecki modeled a tree as a pair of cylindrical tubes: a short, permeable tube (the phloem in the leaf) attached to a long, impermeable tube (the phloem in the trunk).
A bayonet tube heat exchanger is typically a pair of concentric tubes, the outer of which has a closed end that creates a clearance pass between the inner and annulus tube.
