My Fleck 5600 main unit had a slight drain line leak during normal operation. (You could hear him dove down the drain and hear the device hiss slightly at the drain line junction.) This kit suited the problem and was VERY easy to install. There is a great video on YouTube showing exactly how to install this kit - just search Fleck 5600 valve replacement and you will see. The repair took about 15 minutes. When inspecting my old valve that I removed, I noticed vertical wear marks and tiny chips in the green Teflon coating. At one point it reached to the brass below, about the width of a pin, so I'm guessing that's where it was leaking. My unit ran 12 years before this repair was required; So I hope I'll be good for at least 12 more now.
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