Abstract: A connector and a fixing method of this connector, which in particular are used for a submarine apparatus, in which in case that the connector is fixed to the submarine instrument tail cable, a polyethylene sheath covering the submarine instrument tail cable is prevented from melting at brazing process, are provided. A connector main body, a setscrew having slit whose direction is its stretching direction, a coupling end component, and a pipe into which the tail cable is inserted are provided. And the pipe is connected to the submarine instrument tail cable. First, the connector main body and the pipe are brazed together by heat without setting the setscrew having slit. And after the brazing process, the setscrew having slit is set to the pipe through the slit, and then the setscrew having slit is fitted to the connector main body. As a result, the heating process can be performed efficiently and the heating time can be reduced and the polyethylene sheath is prevented from melting.

Abstract: The present invention relates to a sealed vessel and a method of testing air tightness of the vessel. In the sealed vessel, the vessel body and a lid are sealed with two O-rings. The sealed vessel has a hole communicating the space sandwiched by the O-rings and the outside of the sealed vessel and a hole communicating the inside and outside of the sealed vessel. In case of testing the air tightness of the inner O-ring, gaseous helium is injected into the space sandwiched by the O-rings and the gaseous helium spread into the vessel is measured. In case of testing the air tightness of the outer O-ring, the vessel is pressurized by the gaseous helium from the outside and the gaseous helium spread in the space sandwiched by the O-rings is measured.