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2. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

3. Backflow - Wikipedia

   en.wikipedia.org/wiki/Backflow

   Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. [1] It can be a serious health risk for the contamination of potable water supplies with foul water . In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl.

4. Backwater valve - Wikipedia

   en.wikipedia.org/wiki/Backwater_valve

   Backwater valves commonly activate when a city's sewer lines are unable to handle a large amount of falling precipitation; this puts homes that are tied into the storm lines at risk of having water back flow into them. [citation needed] There is a big difference between backwater valves and backflow preventers: [citation needed]

5. Air gap (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Air_gap_(plumbing)

   This arrangement prevents any contaminants in the sink from entering into the potable water system by siphonage; this is the simplest form of backflow prevention. A common use of the term "air gap" in domestic plumbing refers to a specialized fixture that provides backflow prevention for an installed dishwasher. This "air gap" is visible above ...

6. Does homeowners insurance cover water damage? - AOL

   www.aol.com/finance/does-homeowners-insurance...

   Generally, water or sewer backup is not covered in a standard home insurance policy. ... Prevent additional damage by stopping water flow at the source. If a pipe bursts, shut off the water ...

7. Atmospheric vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

   An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water system.. Diagram of Atmospheric Vacuum Breaker in both working states.