Greg, that tubing is almost identical to "Smurf tube." It connects to ... nothing! You simply poke it through the hole. No clamp or fitting at all.
I would often find boxes with the tubing protruding excessively into the box, or stopping just short of the box.
The tubing is installed into routed chases in the masonry, and secured by the mortar used to patch the chase. No clips or staples or clamps.
The boxes themselves have extremely weak mounting to the wall. You can often see them move about when you have them open.
Devices typically have ears that expand out, you hope to catch on serrations inside the box. The arrangement is similar to that used on some of our old-work boxes, but not nearly as secure.
As a result, simply 'pulling the plug' frequently results in the box partly pulling out of the wall. "Child art" instructs all that the "proper" way to pull a plug is to first place one hand against the cover-plate, holding the box in place; then you pull the plug with the other hand.
