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Stan's 2oz Tire Sealant Injector measures the desired amount of sealant then attaches to your valve stem for easy, no-mess application. And, it works on Presta and Schrader valves!
Sealant can only be injected into valves with cores removed
Tire Installation on Stan's Tubeless Wheels
Mountain Bike Tire Installation on Stan's Tubeless Wheels - Stan's NOTUBES