It is as though the fitting has a built-in
brain or computer that tells it to seal tighter under pressure,
reverses it's seal under vacuum, and continues to seal at zero
pressure since the elastometric o-ring has a capacity for remembering
it's original shape.
The O-ring is the simplest, most ingenious, and effective
way of sealing.
The Locking nut and tapered ring holding the tubing works
in much the same manner as the o-ring, holding the tube tighter
under pressure -in effect making a "mechanical weld."
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