1The pump head has a flow rate of 1.5 ml per turn, and the recommended speed is less than 400 rpm (short working time and sufficient heat dissipation, and the maximum speed can be designed to 500 rpm if necessary). 2The pump cover is fixed by hand twisting screws, easy to disassemble and install, and quickly replace the pump tube. 3Pump tube guide groove to prevent damage to the pump tube. 4The wheel frame adopts ball bearings, which is silent and has a long service life. 542 stepper motor is about 30W power, energy saving and environmental protection. Item Type: Step Motor Peristaltic PumpModel: G928SM (stepper motor right angle)Motor Type: 42 stepper motorPump Head: Roller peristaltic pumpPump Cover: Transparent PCNumber Of Rollers: 3 rotor rollersRoller Bracket: 304 stainless steelInstallation Method: Right angleFlow Range: 0-400ml / Min (pump Tube: Inner diameter 6.4mm outer diameter 9.6mm)Standard Pump Tube: Food grade platinum vulcanized silicone tubePump Tube Size: Approx. 6.4 x 9.6mm / 0.3 x 0.4inPump Head Flow Per Turn: 1.5 ml, recommended speed is less than 400 rpm (short working time, sufficient heat dissipation, maximum speed can be designed to 500 rpm if necessary)Motor Power: 42 stepper motor about 30W 1 x Peristaltic Pump1 x Hex Wrench