A backflow preventer is a device installed in a plumbing system to prevent the backflow of water. Backflow can occur when the water pressure in the main water supply drops, causing water to flow back into the plumbing system from other sources, such as a water heater or irrigation system. This can contaminate the main water supply with harmful bacteria or chemicals.
Backflow preventers are an important part of any plumbing system, and they are required by code in many areas. There are different types of backflow preventers, but they all work by preventing water from flowing back into the main water supply. Some common types of backflow preventers include:
