Originally Posted by day_trippr
No problem if you sweat solder the coupler using non-toxic "silver" solder and the flux for same. You should be able to pick everything up at any decent hardware store...
+1 - if possible you should soldier the joint. The brass *should* be fine, but the plastic parts could have an issue with the boiling wort and leak.
When I was a new home brewer I tried joining two chillers with vinyl hose in the wort. Had a lot of really watery beers until I figured out the problem.