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The double ferrule compression fitting consists of four precision engineered parts designed to provide secure leak-proof joints capable of satisfying high pressure, vacuum and vibration applications. Fittings are supplied complete and ready for use. The front ferrule compresses onto the tube as it moves down the cone of the body creating a pressure/vacuum-tight seal on both tube and body by the interface pressure and surface finish of mating components. The Suparcase® back ferrule then deforms inwards in the cone of the front ferrule, forming into the tube and creating a strong mechanical hold on the tube. Parker can supply both tube and fittings to meet your instrumentation requirements.