milKit How To Measure and Refill Sealant

milKit patented valves make your Tubeless life easy!
There's no need to deflate or remove the tire to check if tubeless sealant needs topping up. Simply remove the valve core, use the syringe to check how much sealant remains, and also to add any extra that's needed.
Quick, clean, easy!
Visit milkit.bike/tu... for more information.

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What's the plastic stick on the end of the valve core for?