pi-pump® - Fast Release, red, for pipettes up to 25 ML. Many years of trouble-free use have made the pi-pump® one of the world's most popular pipetting devices. Accurate, precise and safe-even for use with toxic or corrosive chemicals. Simply rotate the wheel forward or backward for easy and precise filling or emptying. Color-coded by size for easy identification. When the wheel is stopped, the piston remains in the required position and holds the liquid inside until ejected. pi-pump® provides a firm, positive fit for all standard pipettes.