On-demand pumps have a pressure switch that makes the pump build up pressure in the fresh water line.

按需水泵有一个压力开关，使泵在淡水输送线上产生压力。

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On-demand pumps have a pressure switch that makes the pump build up pressure in the fresh water line.

按需水泵有一个压力开关，使泵在淡水输送线上产生压力。

youdao