Description:

The Livingstone Rubber Stopper with One Hole is a reliable solution for sealing laboratory glassware while maintaining functional access to internal contents. With precision sizing—16mm base diameter, 20.05mm top diameter, and 21mm height—this stopper ensures a snug, secure fit across a range of test tubes and narrow-neck flasks.

Molded from resilient lab-grade black rubber, it offers excellent elasticity and chemical resistance, helping prevent leaks and preserve sample integrity in controlled environments. The single central hole accommodates tubing, thermometers, or probes, allowing integration with closed-loop systems, distillation setups, or gas delivery configurations.

Ideal for educational labs, research institutions, and industrial testing environments, this stopper supports safe containment of fluids, vapors, and experimental substances while facilitating hands-free system connections. Its tough yet flexible design withstands repeated use and is easy to insert or remove without compromising form.

Supplied in packs of 10, it provides convenience and cost-efficiency for multi-station setups or high-volume use.