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Question:

Is there any way to insert a plactic tube into another tube that is a bit wider?

It is for a plastic tube that goes from the engine of my motorized paraglider to the inlet of my new gas tank. The plastic is a little too tight and I can't warm it up with a flame because of gasoline that may still be in the engine.

Answer:

Then try going the other direction and freezing the smaller tube. That may make it shrink enough to fit.

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