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The 881399 RPZ or Reduced Pressure Zone Valve Air Gap manufactured by Watts is an Air Gap drain fitting device. This inline check device is self contained with a single cover design and is highly durable corrosion and rust proof due to its bronze boy. The design is such that it directly attaches to a relief port on a RPZ backflow device and pipe and any discharge is directed to a safer place via a drain. An added advantage is no special tools are required for servicing. The air gap valve is available in sizes of inch and inch diameter.