The diameter of the outer tube (3) is larger than the flexible tube (2) and the diameter is reduced to the diameter of the flexible tube (2) in the portion connecting to the flexible tube (2).

The tube has a diameter at least 1.1 times the diameter of the impeller.

The diameter of the opening portion (6) is the same as the diameter of the tube (7).

The outer diameter of the inner pipe (11) is adapted to the diameter of the outer pipe (12) so as to form an annulus (25) between the pipes.

The diameter of tube (7) corresponds to the standards in force.

The tube or flow diameter downstream of the restrictor only gradually or slowly increases.

The tube (7) diameter is not more than 10 mm.

The diameter of a tube using this electrode can be small.

This tube (10) is formed with two end portions of substantially similar internal diameter with the diameter of the tube gradually increasing towards the central section.

The tubing includes a non-uniform outer surface configured to cause formation of undulations in a diameter of the tubing upon expansion of the tubing.

As the braided tube (15) inflates, the diameter of the tube (15) increases and its length decreases.

The second passage includes the annular region defined by the bore diameter and the outer tube diameter.

A detection fiber (150, 345) is also proximate to the capillary tube (110, 340) , and the detection fiber (150, 345) has a diameter the same size or larger than the internal diameter of the capillary tube (110, 340) .

The diameter of an unstretched tube (4) is a little smaller than the diameter of the inner ring (3).

The preferred method of compaction is by reducing the diameter of the tube while rolling the fins into the surface of the tube.