VENT GUARD? Is a protective enclosure designed exclusively for the air release valve found in many public water supply systems.
通风口的保护外壳设计，专用于许多公用水供应系统中的空气释放阀。
In case that the well producing lots of air we recommend to add air release valve.
假如水井从地底吸收气体，则表明其深度不够。假如水井产生大量气体，我们建议增设排气阀。
In case that the well producing lots of air we recommend to add air release valve.
假如水井从地底吸收气体，则表明其深度不够。假如水井产生大量气体，我们建议增设排气阀。
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