Maybe it can I haven't tried it - it seems a bit of a hack and I've always preferred to trim the tube and install a new ferrule instead. Some say that wiping a bit of pipe joint compound on the ferrule can help seal a small leak. Plastic tube can be cut with a knife but your copper tube should be cut with a proper tubing cutter. Designed to connect two pipes, plasson compression fittings have three parts the compression nut, ring and seat. If a leaky compression fitting can't be resolved by cleaning the mating faces and carefully re-assembling, usually the next step is to cut off that last inch or so of the tube, slide a new ferrule onto the tube, and assemble again. It can leak if there's debris in the joint, if it's not assembled square, if a part (usually the ferrule) is nicked, or if it's overtightened. The compression fitting is designed to seal dry, ie without the white Teflon tape or pipe joint compound. The brass insert is used only with plastic tubing. With the introduction of quick-connect style fittings to the water treatment industry, the compression fitting was used less frequently, but it's still a great fitting that can. Your copper tube should have a brass ferrule like the one shown loose in the photo. A compression fitting compresses a component of the fitting into another component, usually some type of tubing, to create a watertight seal between two different lines. It's shown with a white plastic (Delrin/acetal) ferrule and a brass insert. I didn't have any copper tube on hand the blue tube is polyethylene plastic instead. Here is a photo to give names to the parts you're probably working with. Your question doesn't mention where you're located, but I'll speculate USA and from that infer that you're working with 1/4" tubing and a compression fitting - this is the most common arrangement for refrigerator water supply in the US.
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