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Backwater valve : ウィキペディア英語版 | Backwater valve
There is a big difference between backwater valves and backflow preventers: A backwater valve prevents raw sewage from backing up into your home through your toilets, showers, etc. A backflow preventer deals with protecting your potable water source from being contaminated by a reverse flow of foul water (ex: isolating your toilet's flush cistern and water supply from the toilet bowl water itself). 〔()〕 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Backwater valve」の詳細全文を読む
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