Rubber Stopper, #4, 25mm, 2 hole

These rubber stoppers are of high quality, soft, resilient rubber. Diameter is for 25 mm test tubes, and holes are for 6mm glass tubing.

These stoppers are size 4 and are drilled with two holes. Size 4 stoppers have top diameter of 26mm, a height of 25mm, and a bottom diameter of 20mm.