What's the difference in the Dynovalve and Econovalve? I see on Savi's website under test results, the older results were based on the econovalve. Researching the Econovalve I see that Walker products is the manufacture of the Econovalve. Did Savi sell the rights to them or was is ever Savi's product? The pictures on Walkers site and Savi's site show an identical looking product. When I contacted Walker to get clarification they state they manufacture the Econovalve and Savi the Dynovalve. I'm a little confused.
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