Abstract: A pump-type apparatus is disclosed for withdrawing liquid sample from a sample vessel without the need to open the sample vessel. The apparatus comprises a holder, a cannular having a sharp tip for piercing the closure on the sample vessel and through which pumping air is introduced into the closed vessel, a liquid withdrawal tube passing through the holder and the cannula through which liquid is removed from the vessel, and a compressible bulb which when compressed introduces air under pressure into the vessel to force liquid out of the vessel through the liquid withdrawal tube. The liquid withdrawal tube is movable so that it can be retracted into the cannula while the closure is being pierced by the cannula, and so that it may be adjusted to withdraw liquid from different liquid levels or heights in the sample vessel. A seal is provided between the holder and the liquid withdrawal tube that allows movement of the tube while sealing its exterior relative to the holder.