Enables representative sampling of multi-phase liquid wastes, operating within a wide range of viscous, corrosive, high volatiles or solids content liquids, except those containing ketones, nitrobenzene, dimethylformamide, mesityl oxide or tetrahydrofuran. Comprises a 1.53m (5ft) x 1.9cm (¾ inch) i.d. tube, with valve at the base which is controlled by an internal rod. In use, the rod is pressed to close the valve, the tube is then immersed to the desired depth, then the valve opened by pulling the rod back 5 to 8cm. The rod is then pushed to close the valve and sample is removed.