| 摘要 |
The externally threaded portion of the lower part of a corporation cock main body is screwed into a threaded hole bored in a part of a water-service pipe, with an annular packing of highly elastic material interposed under compression between the corporation cock main body and the water-service pipe, the repelling recovering elasticity of said annular packing serving to firm the fastening of the corporation cock to the water-service pipe and prevent leakage of water through the threaded connection.
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