Hi Quick1
I think the answer your looking for is an O ring..
Maybe with a matching groove inside the acrylic tube for the O ring to 'pop' into.
Ummm, no. Have that. did that. twice. The O ring just didn't work out for me, Either my O rings were larger or the fit tighter or whatever. For an O ring to seal solid and keep it from pulling apart it needs to be really tight. If it's really tight then it's going to fracture the acrylic tube. Maybe not right away then when you knock it over or bang it on something or go to squeeze it together because it's pulling apart slightly. I want to seal/glue mine, semi-permanently, without putting undue pressure on the tube. I haven't ruled out silicone sealer yet. Maybe I just didn't clean or prep the acrylic properly. I would rather nolt epoxy it or JB Weld or something in case I want/need to rebuild it. I suppose with enough effort you could remove that stuff after destroying the tube but that's going to be towards the bottom of the option list (unfortunately that's the only alternative option on the list at the moment).
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