Presta Valve Adapter

A useful item that I recommend to have on your bicycle at all times is a Presta Valve Adapter.   

I carry/store one screwed backward on my front wheel presta valve stem. It protects the presta valve and when air is needed in the tire/tube, the adapter is reversed which then allows the easier Schrader pump connection to put air in the presta valve.  I find this a much more reliable means to pump tires.  When touring, vehicle tire pumps can also be utilized to speed up tire pumping needs.   

I suggest picking up a Presta Valve adapter when you visit your local bicycle shop! 
The cost is minimal.