repaired drinker

 Our newly repaired drinker was frozen over this morning at -7 degrees. When I fed the cattle at about ten, I broke through the ice with my heel.  Suspect the valve may be frozen as well.  But when I checked at two, the cattle had reopened the trough and were drinking. I could hear the water running so the valve must have been open.  A step, but -7 is not as cold as it is apt to get.  We aren't to February yet.