Ideal for science classrooms and labs, these two-hole rubber stoppers help teachers and students securely seal flasks and test tubes during experiments. Designed for safe handling of liquids and gases, they are suitable for primary, secondary and college science activities.

• Stoppers are designed for use in professional laboratories, but are perfect for a variety of applications in the home and garage.

• Made from durable, chemical-resistant rubber

• Bottom Diameter: 27mm

• Top Diameter: 31mm

• Length: 31mm

• Temperature Range: -20°C - 70°C

• Pack of 10

• Please note: Extreme care must be used when inserting glass into the holes in rubber stoppers.  See CLEAPSS for details.