- 501R rapid-loading pumpheads accept tubes up to 8.0mm bore and provide flow rates up to 3.5 litre/min
- 501FAC/RL pumps have a single channel with a 501RL spring loaded pumphead, an induction motor, Watson-Marlow gearbox, and a faceplate giving flow rates up to 2.7 litre/min
- 501FDC/RL pumps have a single channel 501RL pumphead, 12V DC motor, gearbox, and faceplate, giving flow rates up to 2.2 litre/min
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