Yeah, I just realized you posted the video link. Yeah that is a specialized fitting for ease of installation. It looks like it has an O-ring for making a good seal and it is larger so that it can easily be turned and installed by hand. Larger diameter fittings are easier to fasten since you have more circumferential area to make a larger “moment-arm” to transmit your force. Now I am getting into engineering terms haha.
Think of it like trying to pry up a heavy rock by your hand, then you grab a long and strong stick and use that to pry the rock. The long stick makes it easier because you get a long moment arm that takes most of the stress with little force from the user.
If those fittings were smaller they would be harder to tighten by hand. And then the operator would have to carry a tool box/wrenches with him everywhere he goes (who wants to do that?!?)
I like how they design those accessories for ease of use. That is really the “wow” factor that promotes a great user experience.
