Flared connectors should not be confused with
compression connectors, since they are generally not interchangeable. Lacking a
compression ring, they use a threaded nut instead. A flaring tool is used to
enlarge tubing into a bell shape matching the tapered, projecting conical shape
of the flare fitting. The flare nut, which has previously been installed over
the tubing, is then tightened onto the fitting. Typically made of brass or
plastic, stainless steel or other materials may be used.
Although flare connections are labor-intensive, they are
durable and reliable. Considered more secure against leaks and sudden failure,
they are used in hydraulic brake systems.