A system for infusing fluids into the human body includes a peristaltic-type metering apparatus which controls the flow of fluid through a disposable administration set at a preset rate. A compensating circuit within the metering apparatus automatically varies the operating rate of the metering apparatus to compensate for dimensional variations in the apparatus and the tubing.

There is provided an overcap which fits closely over a standard cap for a container (15). The overcap gives positive visible indications when it is removed and such indications cannot be reversed, thus visible evidence is provided when the overcap is removed or tampered with. The deformities which are observed upon the removal of the overcap are the servering of breakable tabs (5) connected to a h...