How did you put the whole in your reservoir for the connector. I imagine it has to be a nearly perfect (if not perfect) circle in order to get a good seal. Also, what do you do to fill your reservoirs.
We used a big drill.


I don't know if it is the norm to just remove the line from the barb and use the shut-off, or if that process repeated over and over will eventually damage the tubing, in which case you either use something else to fill it in place, or keep taking off the connector, which I think would lead to similar problems.
Not sure what you mean? You fill the reservoir with a bucket of water, or a really long hose.