Rubber Stoppers / Rubber Bungs – 1 Hole, 29mm (Pack of 10) [1162]

These high‑quality 1‑Hole Rubber Stoppers are designed to create a secure, airtight seal for laboratory glassware. With a 29mm bottom diameter, 31mm top diameter, and a length of 32mm, they provide a snug and reliable fit for larger test tubes, flasks, and other lab vessels used in school science experiments.

Each stopper includes a single pre‑drilled hole, allowing the safe insertion of glass or plastic tubing for gas collection, liquid transfer, distillation setups, or closed‑system investigations. Made from durable, chemical‑resistant rubber, these stoppers are perfect for repeated use in busy educational laboratories.

Supplied in cost‑effective packs of 10, these rubber bungs are ideal for class sets, group work, and practical science demonstrations.

Key Features

• Durable rubber stopper with 1 pre‑drilled hole
• Bottom diameter: 29mm
• Top diameter: 31mm
• Length: 32mm
• Provides a secure, airtight seal for laboratory glassware
• Suitable for inserting glass or plastic tubing
• Resistant to common laboratory chemicals
• Supplied in packs of 10

Ideal for School Science Lessons

These 1‑hole rubber bungs are perfect for a wide range of KS3, GCSE, and A‑Level practical activities, helping students safely and effectively carry out experiments involving gases, closed vessels, and controlled reactions.

• Setting up gas delivery systems for chemistry experiments
• Sealing flasks and test tubes in closed‑system investigations
• Supporting experiments on respiration, fermentation, and gas production
• Allowing the secure insertion of tubing for gas transfer or collection
• Ensuring safe, leak‑free operation of laboratory glassware

Strong, reliable, and designed for educational use, these rubber stoppers are an essential consumable for any school science lab.