Works very well,
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This review is from: Gazboat Presta to Schrader Valve with O Ring "Free UK Shipping" (Misc.)
This product worked very well and is particularly useful if you want to convert to a schrader valve. It certainly makes inflating the tyre easier and to a better pressure. What you do is simply loosen the presta air valve, screw on this adapter, and then inflate. If you do not loosen the presta air valve you will not be able to inflate the tyre. The presta valve is protected by the adapter so no risk of losing air having loosened the valve.
A Helpful and cheap solution as I can now inflate the tyre using an electric air pump or at the garage.