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How can this product be sold? There is no vacuum breaker to prevent contaminated water from entering the water supply.

Take a look at this from this old house. What a joke, this is how they advise to install a 2nd sink. http://www.thisoldhouse.com/toh/video/0,,20804030,00.html

I'm not a pump man but I have looked at your csv and it appears to be nothing more then a pressure reducing valve. John