These robust rubber stoppers with a single hole are ideal for securely sealing laboratory glassware during science experiments in primary, secondary, and college settings. Designed for safe and reliable use, they help prevent spills and contamination while allowing tubing or thermometers to pass through the hole.

• Made from high-quality, chemical-resistant rubber

• Easy to clean and suitable for repeated use

• Bottom Diameter: 33mm

• Top Diameter: 38mm

• Length: 38mm

• Number of Holes: 1

• 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.