Stoppers fit tightly to prevent chemical leaks. Our 5 mm glass tubing fits in the one- or two-hole rubber stoppers. For small test tubes use #00 stoppers. Use #0 for large test tubes, and #1 for extra large. Use #6.5 stoppers for 250 ml flasks. Use a cork borer to drill holes in the corks.
Use our quick & easy guide to identify the size of stopper you need.
Save when you buy 10 or more of one of these stoppers!
This set of six cork borers allows you to make uniform holes in rubber ... more
These #0 rubber stoppers are 13-17 mm diameter. #0 rubber stoppers fit ... more
These #0 rubber stoppers are 13-17 mm diameter with one 3 mm diameter ... more
These #0 rubber stoppers are 13-17 mm diameter with two 3 mm diameter ... more