"i'm pretty sure if you sealed your loop 100% you wouldn't have that problem. the cap helps seal your system, so you wouldn't have to add water as often."
Nah, all tubing is porous to a point, and will allow the liquid to leech into the air. Clearflex or similar (thicker walled tubing) will do it much less than cheap vinyl tubing; but then, i doubt anyone that would buy this would be using cheap vinyl tubing.
Wouldnt be too hard to knurl the end, would it? I know I'd probably take to it with pliers (only thing i have handy, most of the time) which would ruin it.
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