Use instead of Pasteur pipettes with pipette controllers for liquid aspirations. Aspirator Pastettes allow you to safely aspirate liquid from containers such as tissue culture flasks or Winchester's by connecting the Pastette (transfer pipette) to your pipette controller or vacuum line and drawing off the fluid. Fits most makes of pipette controller. Manufactured from soft polyethylene, they will not break and therefore offer a safe alternative to glass Pasteur pipettes. They are also the best choice for delicate and valuable cell lines and when working with infectious or hazardous materials.