... lever-operated knife switch 杠杆操纵闸刀开关 lever-operated valve 杠杆操纵阀 lever switch 杠杆开关 ...
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lever -operated valve 杠杆阀
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Following installation, the valve lever MUST be operated AT LEAST ONCE A YEAR by the water heater owner to ensure that the waterways are clear.
安装后，热水容器拥有者每年必须至少操作阀杆一次，以确保水路畅通。
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