On the subject of the sight glass--- Mine leaks and some time ago I tried to get it out and apart to reseal it. I was unable to get the nuts on the lines connected to the sight glass assembly to loosen with two large open end wrenches. Not wanting to break the sight glass assembly or damage the nuts I stopped trying. That's where I stand at this time. If someone has encountered this problem and has any suggestions how to get the line nuts to release I'm all ears.