The present invention confirm that the first tube end and the tube is formed on one side; Ensure that the clamp is inserted and connected to the pipe installation, equipped with a sealing that seals the receiving groove therein; The leak detection unit to be formed to an area of ​​the clamping connection, detect the leakage, by detecting a tension of the elastic member provided therein; It is inserted into the connection clamp and a second tube that is connected to the expansion pipe of the first pipe body,
The leak detection unit detects one lesson that drilling on the outer peripheral region of the connection clamps; And a plate-shaped resilient member which is installed so as to close the sensing aperture in the inner side of the connecting clamp; Further comprising a detection that is configured to install to sense contact ball at the outer side of the connecting line and the clamp,
Further comprising a thin body of metal disposed between the connecting clamp and the elastic member,
Are formed on the exposed surface of the metallic body exposed by the said sensing ball, is formed to horizontally protrude to both sides around the central portion of the metal member when raised by the pressure receiving body wherein the metal comprises an plurality of barrier across the line the sense and it characterized in that.
According to the present invention, the first tube and the second effect by connecting the clamp formed by the connecting portion leak detection joints of pipe body, a stable sealing joints and at the same time to detect the joints leak.