capped

 We managed to get the offending drinker pulled off, the line from underground sufficiently dried up to cap it and got the system covered with a heat lamp on it, which we hope will hold until the warmer weather next week eases the replacement of the unit.  Thirty degrees at the start just after noon yesterday and 17 degrees with an increasing northwest wind when we finished at four.  Timing was critical.  Now we can run the system twenty four hours a day instead of off and on to minimize the leaking.  The two cattle groups share one substitute drinker for a few days.  Sometimes a thing goes right!