Sounds like a good idea, but it's actually easier to buy small stan bottles, fill them up, and use them to squirt the sealant through the valve. The screw system is well made, but it just doesn't work. It's slow and messy because you have sealant in the syringe when you take it out and you have to unscrew it from the valve. So yes, it sounds great, but it's actually a waste of money.
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