Nitrolift's nitrogen gas actuators are self contained and are designed to surpass 100000 garage door cycles. A gas actuator uses a compressed gas, contained in a cylinder and compressed by a piston, to exert a force. Gas actuators provide more constant force throughout the whole stroke length providing optimal garage door balancing throughout the opening and closing cycle. This constant force enhances the life of the electric garage door operator as well as garage door hardware such as hinges and rollers. Simply, gas actuators provide extremely high holding forces and do not instantaneously break like torsion and extension springs.