Compression fittings (at times called "lock-bush fittings") include a tapered, concave conical seat; a hollow, barrel-shaped compression ring (at times known as a ferrule); and a compression nut and that is threaded on to your body with the fitting and tightened to make a leakproof connection. They are usually made http://emilianolkgcw.imblogs.net/16436845/top-guidelines-of-tube-fitting