A molded plastic rivet for affixing two parts to each other when the rivet is inserted through two mutually aligned apertures in the parts. The anti-hysteresis feature adjusts the command signal up or down, depending on the direction of the command, a predetermined amount based on the amount of hysteresis in the system. When a consumer wishes to fill or re-fill the container, the consumer places the container adjacent a reader that interprets the indicia to identify the base fluid to be dispensed.