The collar is opened up, and the second AquaDam® is pulled inside until it abuts into the first. It is very important that the AquaDams® abut well because the first must serve as a platform to start the second.

The fill tubes are then pulled up through the holes in the top of the collar.

The collar is then slid back over the second AquaDam®, the fill tubes are undone, and the fill hoses are placed inside so filling can begin.

Even though the second AquaDam® has barely been started, the third is already being floated out. You can just see it in the right side of the picture.