The Watts 0061888-9DM2-3/4 Backflow Preventer is a durable plumbing component designed to protect water supplies from reverse flow contamination. Commonly used in HVAC systems, boilers, and hydronic heating applications, it ensures that water flows only in the intended direction, safeguarding potable water from pollutants and chemicals. https://www.partshnc.com/0061888-watts-9dm2-34-backflow-preventor