I just thought of something. Are the top fittings metal on metal, or are the holes cut large enough to make the o ring on bottom contact the fitting only? I'm wondering about leaks now that I read some of your fittings had some issues with the holes. If it is metal on metal (as in the case metal contacting the fitting where the liquid is), then wouldn't an additional o ring for the top part of the fitting be in order?

Nevermind. I just looked closer and realize the fitting is protruding far enough below that it closes like normal. I'll leave this post just so that you know we've got your back and are paying atention! :-)