They seem to be pretty stout if you bang them up against anything, which I have done a lot. The glass is pretty thin at the bottoms where the rubber plug is. Yesterday I lost two more and today they are all good.
Next is to figure out how to get the transfer fluid to and from the house. The evacuated tube supply line is 10' high off the ground and I have an area that I need to go underground to get to the house. The whole goal is to get this to be a drainback system, but that is becoming more of a challenge.
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