These durable rubber stoppers with a single hole are ideal for securely sealing test tubes and flasks during science experiments in primary, secondary, and college settings. Designed for safe use with a range of chemicals, they help prevent spills and contamination in practical lessons.

• Made from high-quality rubber, resistant to acids, alkalis, and ammonia

• Easy to clean

• Bottom Diameter: 13mm

• Top Diameter: 16mm

• Length: 24mm

• 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.