Peristaltic pumps or roller pumps are positive displacement pumps used to pump a variety of fluids. They rely on compressing and releasing a length of hose or tube made of high quality flexible tubing material. The pumping action mimics natural peristalsis seen in many biological systems, using positive displacement to move fluids in a pulsing manner. Procedures will remain contamination-free using these systems, since the only part of the pump touched by the solution is the interior of the tubing. Additionally, the pumps are ideal for handling heavier and more viscous fluids. The flexible tubing requires few periodic replacement and maintenance needs.