What size bolt is perfect for plugging a fuel line? - I'm going to change the fuel filter and don't want leaks?

Or some other household item - doesn't matter.What size bolt is perfect for plugging a fuel line? - I'm going to change the fuel filter and don't want leaks?Because bolts have threads, they dont plug your line. It will leak. Better to use a round bar or pinch it off with vice-grips. If its a metal line, the old extra pair of hands to cap off using a finger works best.

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