1/4" FLARE X 1/8" FPT BRASS FEMALE COUPLING/1/4" FLARE THREADS X 1/8" FEMALE PIPE THREAD. Used with copper, brass, aluminum, welded steel tubing. Used on lines handling hard to hold liquids and gases, including gasoline, grease oil, water, vacuum lines, air lines, LP and natural gasolines, refridgeration and air conditioning. Temperature ranges from 65 to 250 degrees Fahrenheit.