No, not necessarily. The fitting bites into the tubing a little to seal the first time it's tightened, and as long as it's not overtightened, it swivels on the tubing and can be removed/replaced many times. Just don't overtighten it, as it loses its ability to seal as the tubing is compressed further with each installation. Eventually it develops a leak from squeezing the tubing down too far.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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