A virtual path feature in which several virtual channels share an assigned amount of bandwidth is implemented in a network processor. Thus, the motor can be securely float mounted to a part around the wheel of the vehicle and the buffer mechanism 10 can be easily assembled. Weakly ionizable species may be dissociated at different pH levels to facilitate removal from the fluid in an electrodeionization device. A guide element may be provided to assist in rectilinear coaxial movement of the first and second ring elements.