Kolbpipeti otsiku kolvi ja kapillaartoru kuju ja materjal peab tagama otsiku kindla tihenduse ning sujuva toime kolvi ja kapillaartoru vahel, et tagada vedeliku ühtlane doseerimine/väljastamine.
The shape and material of the plunger and capillary of the positive-displacement pipette tip shall confer a good seal on the tip, as well as a smooth action between the plunger and the capillary, to ensure consistent dispensing of the liquid.