It is a bi-folding gate to seperate the end of the run from the man section of it. I had been using the mulch pile and some leftover sections of hardware cloth to seperate it, with zero success. The hens would hop over and lay in the meatie's dog houses.
Now I can use the seperator when I need it, or fold it against the run fence when I don't. My original intention was to leave the run open all summer long, and then close it in the winter for a winter garden.