Tubeless tires require the occasional sealant refill. Every 6 months or so, you have to add some Orange Seal to your tire, cause the liquid evaporates over time. Not a big deal, and even less of a big deal if you have this handy little nugget. Unscrew the core of your tubeless valve stem quickly, without fiddling with a tiny set of pliers. Pop it back in quickly too, and get it nice and snug. Simple. A fine tool to have ‘round the shop!