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).

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References

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