I don't know about yours in particular, but I wouldn't expect that black tube to be a permanent part of the sac. From the little I can see in the pictures, it looks like you should be able to cut it away from the blue part, and the blue part looks like it may or may not be part of the sac. If you try it, go really slow, you may have to due it bit by bit with a utility knife if everything is glued together.
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