We needed a dog barrier for our living room to keep out doggie visitors. Here's what we built from PVC pipe. This is about a 6 food wide opening. The piping is press fitted together. We didn't use any glue. This is short enough that anyone can step over yet tall enough to imply a barrier. The important part is the hook that we made that semi-locks the barrier into place. We can take the barrier down by just twisting off this lever/catch. They come out easy if they aren't glued. We take the whole thing down when we have guests or when the Mah Jongg crowd comes over.