Rubber Stoppers / Rubber Bungs – 1 Hole, 31mm (Pack of 10) [1163]

These durable 1‑Hole Rubber Stoppers are designed to create a secure, airtight seal for laboratory glassware used in science lessons. With a 31mm bottom diameter, 36mm top diameter, and a length of 35mm, they provide a reliable fit for larger flasks, test tubes, and vessels used in practical experiments.

Each stopper features a single pre‑drilled hole, allowing safe insertion of glass or plastic tubing for gas transfer, collection, or delivery during experimental setups. Manufactured from tough, chemical‑resistant rubber, these stoppers offer excellent durability for repeated classroom use.

Supplied in convenient packs of 10, these rubber bungs are ideal for class demonstrations, group work, and routine practical lessons.

Key Features

• High‑quality rubber stopper with 1 pre‑drilled hole
• Bottom diameter: 31mm
• Top diameter: 36mm
• Length: 35mm
• Provides an airtight seal for large laboratory vessels
• Suitable for inserting plastic or glass tubing
• Chemical‑resistant and designed for repeated use
• Supplied in packs of 10

Ideal for School Science Lessons

These 1‑hole rubber bungs support a wide range of KS3, GCSE, and A‑Level science experiments, enabling students to safely conduct activities involving gas flow, sealed vessels, and controlled reactions.

• Creating gas collection and delivery systems for chemistry experiments
• Sealing flasks and tubes during closed‑system investigations
• Supporting practicals involving respiration, fermentation, and gas evolution
• Facilitating safe insertion of tubing for gas transfer or measurement
• Ensuring leak‑free setups for accurate experimental results

Strong, dependable, and classroom‑ready, these rubber stoppers are an essential consumable for any school science laboratory.