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Drain stoppers from Grainger keep water on the surface in sinks, basins, laundry tubs and other drain openings. You can use flat rubber stoppers for kitchen sinks and cleanout plugs for threaded, drain access. Silicone stoppers are highly recommended for all tissue culture work in biology, micro-biology and hematology, as well as food science, technical, medical and hospital apparatus. Buy drain stoppers today!