I purchased several of these couplers to connect RCA style audio cables. I assist in televising homeowners association meetings, and these are by far the best value. Very inexpensive. You'll spend much, much more at Radio Shack for the exact same thing. I also strongly suggest people visit monoprice.com before any other retail resource. You'll be amazed.
Beyond the fact that these were exactly what I needed and work well, they're a bit loose.
Even with the slightest pull, whatever cable I have plugged into these will come out (whereas the same connecter will fit quite snugly onto another jack). As such, I would suggest securing the connections with tape or something similar.