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I have a
Gluing plastic is never a sure thing. 1/4" brass male hose barb a few bucks at Home Despot. Drill undersize hole, heat the fitting and screw it in. Proper drill and tap is better

I have a little assortment of hose barbs. I thought I'd try the epoxy first and if that doesn't work I'll do the barb. The tricky bit with the barb was that there's not a lot of room between the separator and the copper line (3" of rubber hose, maybe 1 3/4" of actual distance) and the barbs I've got would shave about 1/2" of that.

I really like your idea of heating it up first.....
 
I have a
I have a little assortment of hose barbs. I thought I'd try the epoxy first and if that doesn't work I'll do the barb. The tricky bit with the barb was that there's not a lot of room between the separator and the copper line (3" of rubber hose, maybe 1 3/4" of actual distance) and the barbs I've got would shave about 1/2" of that.

I really like your idea of heating it up first.....

You can't go wrong with J.B. Weld because it's made in East Texas. I even used it to seal up a circular curved cut in the back side of the radiator of my '69 Chevy pickup (in your late teens / early twenties don't drink several beers and try to push something solid over with the front of your truck because the fan will cut the radiator) and drove it for many years no problem!
 
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