Seems fragile but installed well. As soon as I received the package I opened it up and saw that the lines had wrapped into a more "oval" shape (not the round shape in the pictures). I stretched the plastic lines to "remove the kinks". It didn't help even after almost a month of stretching (the project was delayed). It would be nice if the lines were collected in a large loop so that there were no "permanent kinks" in them. In addition, the parts fit together well and still hold air pressure after a few weeks.