DOUBLE FERRULE COMPRESSION TUBE FITTINGS - Hydraulics
DOUBLE-FERRULE TUBE FITTINGS A double ferrule tube fitting is often preferred over a single ferrule. A double-ferrule fitting has 4 parts that, when combined with the tube itself, create a 5-part joint that is more likely to remain leak-free. These four pieces are the nut, a front and back ferrule, and the body of the fitting.
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