KKDD is a DC motor, KKTS is a stepper motor, A is a single channel, and B is a dual channel. Please check carefully and purchase. If you have any questions, please write to us. We will provide free technical support.pump tube size:6.4mm ID x 9.6 mm OD, 800mL/min ;（We also have other different diameter pump tubes, if you need, please write to us）Please note, this is a pump head and motor only. You will need a driver to operate it, as described below. Peristaltic pumps drive fluid through a tube by squeezing it between moving rollers and a stationary shell. The only part in contact with the fluid is the inside of the tubing, making them ideal for sanitary applications and corrosive chemical handling. They transfer a fixed volume per revolution, allowing them to pump gases as well as liquids and self-prime.
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