those types of barbs are a press fit. so they literally just have to be pulled out. easier said than done, but they do pull out. You have to be very careful how you load it, or you may crack the brittle cast aluminum. I usually just grab them in a vice and twist back and force to break the seal and then pull and spin.
remember one thing, there is no going back. The best you can do to add barbs again later is to tap the leftover holes and thread in fittings.
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