Stans no tubes threaded valve extendersthese stans no tubes threaded valve extenders are for use with removable valve core presta valves they allow deep section rims to be converted to tubeless by way of external threads for securing the presta nut featurescnc machined aluminium valve extension 2 grams eachrubber o ring seals inside the valve to eliminate leaksadds 40mm of length to any removable core presta valvecan be used with our road tubeless valvecan be used with any removable core pr