Specifications: The pump head is designed for easy disassembly, which is easy to clean and maintain. With a snap-in design, the pump head can be removed with just a light press of the hand, which is very convenient for the replacement and cleaning of the pump tube. The flow direction of the peristaltic pump depends on the connection of the positive and negative stages of the power supply, and the terminals can be arbitrarily selected for positive and negative stages. Item Name: Water Pump Material: ABS Applicable Power Supply: DC 6V/12V/24V Flow Range: 0.1-100 ml/min Speed Range: 0.1-100 rpm Working Condition: 0-40 Celsius Degree Relative Humidity: < 80% Product Specifications: 1#: 6V/Flat/Black 2#: 12V/Flat/Black 3#: 24V/Flat/Black 4#: 6V/Flat/White 5#: 12V/Flat/White 6#: 24V/Flat/White 7#: 6V/Right Angle/White 8#: 12V/Right Angle/White 9#: 24V/Right Angle/White Features: Durable, Mini, Simple, Easy Disassembly Equipped Pump Tube: Inner Diameter: 2.5mm/0.10", Outer Diameter: 4.7mm/0.19" (Approx.) Driver Size: Diameter: 27.6mm/1.09", Height: 37.9mm/1.49" (Approx.) Pump Head Size: Diameter: 31.7mm/1.25", Height: 20.1mm/0.79" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Water Pump