yeah those jars don’t have a flat bottom either but decided to use them since i have a few. the hot glue worked great though. hopefully i can remove the fittings after adding the hot glue if i need to. I might try a thin neoprene washer on one of the other ones to see if holds.
I would suggest adding more material for the “barbs” to the lid fitting to hold the 1/2 hose better. I was using latex tubing which is pretty flimsy/flexible.
Thank you for the feedback, I will have to get a few more samples of Latex hose to test the fit, the sample I had was super tight (I was only going over the first barb) but it must be on the smaller side.