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Recent news stories have mentioned the problems that some Wisconsin towns are having with their water supply. Learn about Backflow Prevention and protecting our water supply with backflow valve assemblies in this episode from the Building Wisconsin TV series. Host Stuart Keith meets up with Scott Hamilton from ASSE International, Vince Gallo from Plumbers Local 75, Jim Kosmatka from Milwaukee Water Works and Andy Brahm from Illingworth-Kilgust Mechanical.