A peristaltic pump comprises a rotor with rollers and first and second tracks mounted on opposites sides of the rotor. Each track is moveable between a first position adjacent the rotor and a second position spaced from the rotor. The tracks may be linked and moveable together so that as one track moves towards the rotor, the other moves away from the rotor and vice versa. In this way, a single pump can be used to provide two different modes of operation, e.g. pumping liquid when one track is adjacent the rotor and applying suction when the other track is adjacent the rotor.