Can you install dual check valves underground for irrigation system?

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The only thing we can install that works better then a RPBA ( a Reduced Pressure Back flow Assembly) would be to install an Air gap and that's more for industrial, if your in Cali look up your local ferguson or there might be a western Nevada supply, they will carry the right back flow assemblies.


I use the word assemblies because some codes stipulate that if it is non testable it's defined as a device, while if it is test able and has ports for doing so it's called an assembly. After you install one it should be tested, the testing needs to be done by a certified tester. Call around to check prices they can go as low as 50 up to 300$ or more for the same test to be done. At the bottom are the current tester list for CA/NV.


http://ca-nv-awwa.org/CANV/downloads/Current_Backflow_Certified_Testers.pdf
 

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