Zefal Z-Sealant Bicycle Tyre Sealant 240ml Bottle +Tube. Z-Sealant 240ml Bottle +Tube. Puncture prevention sealant. For use with an inner-tube it needs to be injected into the valve using the nozzle provided or into the side of the tyre for a tubeless system, helping to prevent punctures up to 3mm.
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