Benjamen’s recent post about swivel connectors for compressed air lines brought to mind a little sanity saver. This Dynabrade swivel connector has a similar mission but adds a degree of freedom. It can rotate about the male 1/4 in. NPT connection, and the two composite sections can twist relative to one another. When I used this it was with a very light self-coiling hose, and even that was enough to pull the connector straight downwards. When you’re working above something, that can be a problem, but getting the hose out of the way is a simple matter of throwing it over your shoulder. In nearly every other situation, leaving the hose free to rotate is a boon.
The Dynabrade swivel is more flexible than many other options, with a 1/4 in. NPT male connection on one end, and 1/4 in. NPT female port on the other so you can hook up any air hose coupler you like. They retail for $15 apiece from Production Tool Supply and Dynabrade themselves, or $12 apiece from ToolTopia.com.