Ferrule can never be reused once they have been compressed. This connector is directly placed over the pipe and the nut is tightened compressing the ferrule between the pipe and the body of the fitting. Flare less-tube connectors can not be reused because of the characteristic nature of the process.
Also know, are Compression Fittings reliable?
Although compression fittings are generally considered more reliable than threaded fittings, there are some potential problems. In general, compression fittings are not as resistant to vibration as soldered or welded fittings. Repeated bending may cause the ferrule to lose its grip on the tube.
What is a compression fitting plumbing?
A compression fitting is a type of coupling used to connect two pipes or a pipe to a fixture or valve. It consists of three parts the compression nut, the compression ring, and the compression seat. As you can see in the diagram at the left, the nut is slid onto the pipe, followed by the compression ring.