Compression fittings (from time to time named "lock-bush fittings") encompass a tapered, concave conical seat; a hollow, barrel-formed compression ring (at times known as a ferrule); in addition to a compression nut and that is threaded on to the human body with the fitting and tightened to help make a http://gauge-valve83725.mpeblog.com/12339530/indicators-on-tube-fitting-you-should-know