Specialized, replace that compression bung as soon as you can!
Do you mean the design is flawed in general? Or do I need to replace the one on my bike?
Yes, the design is flawed.
Actually, any expansion bung which is installed incorrectly could cause an issue so yeah, this one is more particular, especially subject to the above.
@pjay started
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Specialized, replace that compression bung as soon as you can!