Rubber Stoppers Two Hole - Bottom Diameter: 31mm - Pack of 10

These durable two-hole rubber stoppers are ideal for securely sealing laboratory glassware during science experiments in primary, secondary, and college settings. Designed to withstand regular classroom use, they help maintain safe and controlled environments for practical investigations.

• Made from high-quality, chemical-resistant rubber

• Bottom diameter: 31mm; top diameter: 36mm; length: 35mm

• Number of Holes: 2 (5mm diameter each) for tubing or thermometers

• Resistant to acids, alkalis, and ammonia

• Temperature stable from -20°C to 70°C

• Supplied as a pack of 10 stoppers

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