Abstract: A peristaltic pump for providing enhanced maintenance of a position of an interface between a substantially flexible tube and at least one roller which compressively engages such tube. In one embodiment, two rollers are incorporated on a rotor and are biased toward a raceway by a pivotal action to substantially totally occlude the tube between the rollers and the raceway. The biasing forces for each roller are provided by a pair of concentrically-positioned helical springs. Each of the springs, acting alone, is individually capable of generating sufficient biasing forces to substantially totally occlude the tube in one aspect of the invention. In another aspect, the force generating capabilities applied to these rollers are also monitored. In this regard, a visual indicator assembly is interconnected, for instance, with the above-identified springs.