Like Kubla said! It's a "push on the ring and pull on the tubing at the same time" process. If it fights you, get an adjustable (Crescent) wrench and adjust the jaws to fit around the tubing, then slide it against the fitting for some extra pressure. Sometimes, it takes about 3 hands...or two hands and a foot. You have to hold the fitting in one hand, compress the end/ring into the fitting, and while doing so pull out the tubing. Post a video when you do!
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