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You get two types of extenders- ones that screw on a 'normal' valve. You leave the valve open and that's it. The second, presumably the type that he has require you to remove the valve core from the tube and then screw the extender into it, so the extender has a valve on it.
Pretty big oversight to not have both types with him.
couldn't find presta valves to fit his extenders then? Euro is mostly schrader other than specialist bike shops right? Feel bad for him.