I bought 2 of these for an outdoor rainwater tank in northern climates. During the winter frosts, a valve in the central chamber that was kept closed broke. No problem with the other valve left open. The only temperature reference on American Valve's website for this product is 180 degrees. So I figured brass might survive the Midwest winter. I was wrong. Updated July 2020 Regarding the 3 sometimes scathing comments below: The storage tank is emptied before the first frost each season, so there is almost no water in the tank; maybe a little below, but certainly not at 65 gallons. the level at which the valve was installed. I have had no problems with other valves over the years including another M71QT.
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