| 摘要 |
PROBLEM TO BE SOLVED: To secure high-degree reliability and safety by surely draining service water without leaving the service water at draining time even if there are a curved part, a level difference part, and an inclined part in a service water pipe, and to enhance versatility by coping with even various service water pipes and service water equipment. SOLUTION: This anti-freeze device 1 of the service water pipe is connected to a midway part of the service water pipe, and has a drain plug 2 for externally discharging the service water W in a downstream side service water pipe Pd connected to the downstream side by being switched to the drain side, and is provided with a suction part 3 for discharging the service water W in the downstream side service water pipe Pd from the drain plug 2 by sucking the inside of the downstream side service water pipe Pd via the drain plug 2 switched to the drain side.
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