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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. Reduced pressure zone device - Wikipedia

   en.wikipedia.org/wiki/Reduced_pressure_zone_device

   A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [1] [2] reduced pressure zone assemblies (RPZA), [3] or reduced pressure principle ...

4. 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 ...

5. Ohio EPA grants $1.7M for area recycling and litter ... - AOL

   www.aol.com/ohio-epa-grants-1-7m-141504005.html

   Five organizations in Ashland, Crawford, Marion and Richland counties are among 159 statewide awarded a total of $7.5 million in grant funding.

6. 'The Origins of Norwalk, Ohio and the Firelands' - AOL

   www.aol.com/news/origins-norwalk-ohio-firelands...

   Nov. 29—NORWALK, Conn. — The Norwalk Historical Society in Norwalk, Conn., is pleased to welcome the Huron County and Norwalk, Ohio historian, Henry Timman, to present the virtual lecture ...

7. 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.