Abstract: A pipette filling and liquid dispensing device is attachable to a pipette by a conduit. A resiliently compressable bulb is connected to the said conduit in which a closable opening is provided. By means of the said closable opening alternatingly connection can be established between the interior of the conduit (and the bulb) and the open by uncovering the opening or such connection can be interrupted by closing the opening. A valve unit is inserted in the said conduit, said unit being releasably connected with the conduit and easily removable therefrom.