This EZ pump head makes engagement with tire valve very easily. It only needs one hand to push-on and pull-off. Traditional pump head needs two hands, one hand holds the pump head and another lifts up cam lever. EZ head features 8-fingered clamps, which can lock with metal stem of tire valve and mean time squeeze rubber valve to air-tight with tire valve. It also has auto dual valve system for both, Presta and Schrader.