This pump is featured with fast release pipetting device for precise pipetting & zip quick emptying. We can rotate knurled thumbwheel to draw up or dispense liquids while the releaser may be pushed in for zip-quick emptying. Silicon rubber collects inside to hold various pipettes of standard sizes for molded chuck. This pump can be easily disassembled for thorough cleaning as it resists acids & alkalis. Cone No. Particular Packing 20001 2 ml. 12 20002 10 ml. 12 20003 25 ml.