There is no way that our back flow valve would pass inspection. To replace it will cost us $1100. In addition, the BWW will require us to have the backflow valve inspected every year. The plumber ...

Backflow preventers are assemblies with two check valves and two shut-off valves that prevent reverses in process flow. They may also include test cocks for each chamber within the assembly. Backflow ...

PHOENIX — A Scottsdale hospital recently became the first non-clinical trial site in Arizona to use a new medical tool to perform a tricuspid heart valve ... to prevent the backflow of blood ...