| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem wherein a construction cost gets high and wherein inspection or the like also gets difficult, because a drain plug, a heater and a heat-insulation material are used, or the pipe and the drain plug are embedded up to a freezing depth or more, for preventing water from being frozen in a water service pipe. Ž<P>SOLUTION: This water service pipe anti-freezing device circulates the water using a circulation pump, to prevent the water from being frozen in the pipe, utilizing a property of water. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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