The hydrant or valve pit needs to be opened and checked that it's thoroughly clean instead of filled with any dirt or leaking drinking water. Should the pit is full of drinking water, it ought to be emptied and cleaned.請注意：務必確保已選取的區域來自正確的螢幕截圖（螢幕內），否則裝置將永遠顯示黑色。若您
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