To align and fix a device or a probe in a pipe effectively by a simple means by feeding a pressurized fluid axially through a semiflexible duct by the enlargement of fingers.

A probe 1 includes a body consisting of three parts 3A, 3B, 3C. The probe 1 is connected at its rear part to a semi-flexible duct 4 by a ring 6 supported by an elliptic ornament 5 fitted into a duct 4, and an elliptic ornament 5 screwed into the body part 3C of the probe 1. The duct 4 is wound onto a drum, for instance, and expanded according to the insert quantity of the probe 1 into a pipe. The probe 1 is directly pushed into the pipe by the semi-flexible duct 4. When the probe 1 is fed into the pipe, a pressurized fluid such as air is fed into an axial hole 9 from the duct 4 in order to align the probe 1 in the pipe, and three fingers are protruded.