Rubber Stoppers (Rubber Bungs) – 2 Hole, 29mm Bottom (Pack of 10)

These 2‑hole rubber stoppers, also known as rubber bungs, are high‑quality laboratory essentials designed to securely seal glassware while allowing two simultaneous connections through the stopper. Supplied in a practical pack of 10, they are ideal for frequent use in school, college, and teaching laboratories.

Each stopper features a 29mm bottom diameter, 33mm top diameter, and a 32mm length, providing a secure fit for a wide range of larger flasks and reaction vessels. The two pre‑drilled holes allow easy insertion of tubing, thermometers, delivery tubes, or probes, supporting more complex experimental assemblies.

Manufactured from durable, flexible rubber, these bungs provide a tight, airtight seal while remaining easy to insert and remove, helping protect glassware and ensuring safe, repeatable experimental setups.

Key Features

• 2‑hole rubber stoppers for laboratory applications
• Bottom diameter: 29mm
• Top diameter: 33mm
• Length: 32mm
• Supplied in a pack of 10
• Allows two tubing, probe, or thermometer connections
• Flexible rubber construction for a secure, reliable seal

Ideal for School Science Lessons & Practical Experiments

These 29mm 2‑hole rubber bungs are well suited to KS3, GCSE, and A‑Level science lessons, where larger glassware and more advanced experimental setups are commonly used.

• Connecting gas delivery and outlet tubing in reaction vessels
• Allowing simultaneous use of thermometers and delivery tubes
• Supporting gas generation and collection experiments
• Building more advanced chemistry and physics apparatus
• Enabling safe, consistent student practical investigations

Reliable, reusable, and easy to handle, these 2‑hole rubber stoppers are an essential laboratory consumable that supports safe experimentation and effective science teaching in educational environments.