A Schrader valve core remover is easy to find, but a Presta valve core remover is much harder to find. This one does the job very well, providing a large enough area to apply leverage to tighten or loosen the valve core and holds the core well. Without such a thing, you can use pliers, but that's a surefire way to get damaged threads, and there's never enough room for them to work properly. This is the only way to fly after removable Presta cores. Not only does removing the core allow you to apply sealant to the tires without removing them from the rim, but it also allows more air to flow through the core to help the tires initially fit.
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