will not serve me :(

This is certainly due to my ignorance but I do not expect to receive a valve extender that does not serve me.
In fact I thought it was a model equivalent to the brand topeak, the extender is screwed onto the Presta valve in the tube and you can open / close the valve with a thin rod. In short it lacks additional photos to describe the product, particularly without the cap. The delivery was a little long but consistent with what had been announced. Reviews of other customers do not reflect this.
Note: when my order comments were not those of the product and there was less of photos, this seems fixed now ...