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。
The top riser vent with big mesh size has excellent ventilation. It also effectively guard against flies.
上方大网目透气网孔，通透气佳，即可有效预防苍蝇入侵。
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