Flared connectors shouldn't be confused with compression connectors, with which They're commonly not interchangeable. Lacking a compression ring, they use a tapered conical formed relationship instead. A specialized flaring Instrument is accustomed to enlarge tubing into a 45º tapered bell form matching the projecting shape with the flare fitting. Go, http://needle-valve94869.blogprodesign.com/12140354/the-ultimate-guide-to-tube-fittings