Gibsonguy Posted November 3, 2016 Report Share Posted November 3, 2016 Hi All, I just wondered if anyone can confirm or deny my theory. I've never seen any like this, but can this be an old anti-black-flow preventer? The valve turns completely left and right, but it is sealed at the floor. Because the home is 1950 construction and it's in the slab, I am just making an educated guess.. Anyone? Click to Enlarge 37.89 KB Link to comment Share on other sites More sharing options...
Mike Lamb Posted November 3, 2016 Report Share Posted November 3, 2016 Looks like a typical back-flow valve like you surmised. Link to comment Share on other sites More sharing options...
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