The 2 ½"- 4” 40/50 Air Gap Assembly is used to protect surrounding areas from water leaking out of the relief valve due to a backflow condition or a damaged component in the backflow assembly. Primarily used indoors to protect from flooding or spraying of water onto sensitive materials, the air gap assembly covers the relief valve and diverts water downward into a drain pipe that leads to a safe location. For More Information about the Deringer product line visit backflowdirect.com
