Product review (3 stars): -Installation is easy. Screw and plug in
It did the job, but only after re-buying and and trying to get it to work relentlessly.

-Installation is easy.  Screw and plug in.
-Hard to find this specific coupler anywhere else.  After hours of research, this is the only one of its kind I found.

-Tube that is getting plugged in has to be 100% completely cleanly cut flat AND after you plug it in, it needs to stay perfectly straight along with the tube, otherwise it'll spray and leak
-The superintendent tried to install this, and it leaked all over on 2 separate attempts.  First attempt, it chewed up the plastic tube and tore the end to pieces.  Second attempt, the angle wasn't completely flat (there's not much room behind the fridge...), so it started spraying.  Only on the 3rd attempt of trying to completely smooth out the plastic tube AND fidget it to perfect flat angle did it stop spraying.

It works, "easy" to install--theoretically, but need to do a lot of tweaking, to get it to work properly.