These durable rubber stoppers with a single hole are ideal for securely sealing laboratory glassware during science experiments in primary, secondary, and college settings. Designed to withstand regular classroom use, they help teachers and students safely manage liquids and gases in practical investigations.

• Made from high-quality, chemical-resistant rubber

• Pack of 10 for group or repeated use

• Easy to clean and suitable for use with acids, alkalis, and ammonia

• Bottom Diameter: 31mm

• Top Diameter: 36mm

• Length: 35mm

• 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.