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Just went through my old Dacor manuals that go back to the double hose days and saw nothing like this. Pretty sure it's not mainstream Dacor.... To me it looks like it must be an old Dacor but I'm not sure. ...
Can you post a picture of the first stage?
To me it looks like it must be an old Dacor but I'm not sure. Seeing the first stage will help. Also if there is a logo on it anywhere get a zoom in of that too.
R..