The bike pump comes with a wonderful pump head referred to as the AH4(Patented Auto Head). The top connects robotically to Schrader, Presta, and Dunlop valves with no adjustment in anyway. Push the top down on to any valve you have bought, lock the lever, and get pumping.
CHARGE SWITCH - You are charging otherwise you're inflating. The 2-position change permits you to cost the chamber place one. In place two, that air is compelled into the tire. Now you can use the chamber like a daily ground pump.