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The hydrant or valve pit must be opened and checked that it's thoroughly clean and not crammed with any dirt or leaking drinking water. If the pit is stuffed with water, it ought to be emptied and cleaned.此篇知識可能不適用於所有同類型/系列的產品，部分畫面選項或操作步驟可能會因為軟體版本的不同而有差異