Watson-Marlow Bredel 500 Series peristaltic pumps provide sterility and zero contamination. PumpSil Platinum Cured Silicone tubing further enhances the fermentation process and offers improved batch consistency. A clear flow path and fully swept pump chamber eliminate possible batch contamination and downtime. The pumps provide true positive displacement with no product back-flow or slip, for accuracy to ± 0.5%. Every Watson-Marlow Bredel peristaltic pump is an inherent metering pump with repeatability at 99.5%. Many models include integral digital drives and displays in washdown enclosures. The self-priming pumps accommodate flow rates from 0.1 microliter to 350 gpm, and withstand pressures up to 232 psi. There are no internal universal joints, valves, dead corners, or glands to impede flow, and the pumps are reversible, for back-flushing lines. The pumps can run dry indefinitely without damage and provide up to a 30-foot suction lift.