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Backflow Testing at a Dentist Office

As I tested the first device of three devices, I saw the first one fail.  I saw the needle on my Watts TK-99E fall to about 4 pounds on the apparent reading across the number one check valve.

I continued to test and had to take apart the number 1 check.  Here is what I found.

I was able to clean the device and put it back in service from a Fail to a Pass.

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