What does backflow prevention do?
What does backflow prevention do? A backflow preventer valve is designed to prevent the water in your main water supply lines from flowing in a reverse direction. The valve will distribute the sanitary water from the main supply pipes to the water lines beneath your foundation. Do I need a backflow prevention device? If you've determined the site's hazard rating as low, our 20 mm and 25 mm water meters already have a simple backflow prevention device in them. If the property's water meter is larger than 25 mm, you'll need a separate backflow device. What is the only failsafe...