Flop tube cncern?

[kpin]

I seem to remember a note somewhere regarding a required change from one flop tube material to another. I assume this change has been made but I want to be sure. What is the new material? What is the recommended inspection interval and procedure? I have the old style tank with the flop tube running forward to aft. I see a lot of information on the subject and a lot of people providing for alternative fuel feed. Has the flop tube been a major area of problems in the past? So far I have not experienced anything that would make me be concerned other than from the forum information.

 

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