Although backflow preventers are more common at commercial buildings that have fire sprinkler systems, residential customers may need one, too, depending on local regulations.

After draining out most of the water from the sprinkler system, hook up an air compressor to blow the lines clear of any remaining water. Start by closing the valve on the backflow preventer ...

STEP 3: Once the water is off and the backflow preventer is drained, the next step is to cover it by wrapping it with towels and duct tape, and then drape a blanket over it.

STEP 3: Once the water is off and the backflow preventer is drained, the next step is to cover it by wrapping it with towels and duct tape, and then drape a blanket over it.

If the backflow prevention device (s) is to be installed in a water system that serves a fire protection system (sprinkler, standpipe), additional details will be required. Learn more about backflow ...

While different types of backflow prevention devices exist, Kristin Pattinson, Drinking Water Section Chief with the MO Department of Natural Resources, says the devices all do the same thing.

The purpose of this testing is to ensure that the backflow preventer—a crucial device designed to protect the public water supply from contamination or pollution due to backflow—is functioning ...

For more information on backflow preventers, including their role in protecting public health and the reasons behind the testing requirement, residents are encouraged to view our informative video ...