Features: This small dosing pump has the function of self-priming. Planetary reduction gear transmission ensures flow rate stability and long service life. No valves and seals, allowing for convenient hose replacement and easy maintenance. Flow direction can be controlled by positive and negative connection. Widely used in chemical, laboratory, food, plant, environmental protection, household, and other applications. Specifications: Model: G528 Silica Gel Tube (internal diameter x outside diameter): 1mm x 3mm / 2mm x 4mm / 3mm x 5mm (optional) Motor: DC 6V Current: 250–300mA Operating Temperature: 0–40°C Relative Humidity: 80% Flow Rate: 1 x 3 silica gel tube: 23ml/min 2 x 4 silica gel tube: 65ml/min 3 x 5 silica gel tube: 150ml/min Rotation Speed: 0.1–60 rpm Motor Dimensions (D x H): Approx. 32 x 23mm Installation Hole Distance: Approx. 48.5mm Package Size: 6.0 x 6.0 x 5.0cm / 2.4 x 2.4 x 2.0in Package Weight: 69g / 2.4oz Package List: 1 x Dosing Pump