The subject innovation is block by the mission, which can prevent leakage between the protective tube and tongsingwan protecting the cable index block and to prevent leakage of a mission in as installed tongsingwan as to establish a communication cable between the communication manhole to the mission which can be used as the combination relates to combination block index block.; Conventionally, because in the premises and one for a cable protection tube fixed index block for separately replaced according to the application resulted in an increase in the manufacturing cost and the management and cost.; Thus, the subject innovation is installed is installed on the water pipe to block leakage by the cap that is connected parts of the joint in the through-hole and is formed as an extruded tube with integral projecting longitudinally in the inside is an intermediate rubber member expands to block the leakage for a mission is used, there will, characterized in that the case of using the index block to use the premises in the index block to allow to easily separate the joints connecting the tongsingwan as to ensure that the open through holes to combine.
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