This video by AgentJayZ is the maintenance and repair of AI-25 turbofan. What is that thing moving due to applying certain pressure to that pipe? Can anyone describe its purpose and how it works?

This is what I am talking about

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    $\begingroup$ Reminder: please no answers in comments. $\endgroup$
    – Federico
    Jun 24, 2021 at 12:10
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    $\begingroup$ @Auberron Comments are not for answers, not even partial ones or assumptions for answers. See the help center. If you want to have an informal chat about your question, use a chat room. $\endgroup$
    – Bianfable
    Jun 24, 2021 at 15:42
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    $\begingroup$ once again; comments are for seeking clarification and improving the question. Do not post pseudo answers in comments. they will be deleted. If you wish to answer the question, do so in the answer box below. $\endgroup$
    – Jamiec
    Jun 24, 2021 at 15:47
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    $\begingroup$ @Jamiec: You're right, it's in the book, but yourself you also like to comment, provide anecdotes and even jokes, and sometimes clues for the answer. And frankly I don't see a problem, these elements help others to provide more complete answers. If some cleaning is needed it's always possible to do it later. $\endgroup$
    – mins
    Jun 24, 2021 at 16:45
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    $\begingroup$ @mins If im guilty of it, I would expect those to be deleted also. I am human, I do make mistakes. $\endgroup$
    – Jamiec
    Jun 25, 2021 at 7:40


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