When using EZ-TC, close No. 1 and 2 shutoffs and install sight tube using adaptor fitting.

在采用EZ - TC时，关闭1号和2号关闭阀，采用适配器连接件安装观察管。

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The assembly shall consist of two positive seating check valves located between two resilient seated shutoffs with a hydraulically balanced bypass line and four test cocks .

这种总成应该由两个正向密封止回阀， 两边夹着两个弹性阀座关闭阀， 并配置一个液压平衡旁路管线和四个测试旋塞构成。

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Utility companies use the tech to warn customers about imminent shutoffs.

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