Valve Adaptor - Presta to Schrader

Adaptor to allow use of schrader bicycle pumps on presta innertubes. To use, remove the valve cap on your innertube. Unscrew the little valve end until it stops (does not remove), then screw on this valve adaptor. Then you can use your schrader pump as normal. When finished, remove valve adaptor and screw your valve end in again. 

Presta valve = french valve = "that little skinny valve"

Schrader valve = car valve = American Valve = "the normal valve"