phPrevue's playpen fencing is a fun and easy to use product; far easier to work with than C&C for temporary playgrounds. However, the end connectors are really painful to work with, and notorious for disconnecting.
These clips are the result of many experiments to overcome that difficulty. They pop on and off easily by hand, but hold firm against my guinea piggies' halfhearted attempts at escape.
Also included is a connector for the fencing to the corner cabling of a hex rabbit playpen I have.
The author marked this model as their own original creation.