Rubber Stoppers (Rubber Bungs) – 2 Hole, 31mm Bottom (Pack of 10)

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

Each stopper features a 31mm bottom diameter, 36mm top diameter, and a 35mm length, making them suitable for a wide range of larger flasks and reaction vessels. The two pre‑drilled holes allow easy insertion of delivery tubing, thermometers, probes, or sensors, supporting more advanced experimental setups.

Manufactured from durable, flexible rubber, these bungs provide a secure, airtight seal while remaining easy to insert and remove, helping to protect valuable glassware and ensure safe, repeatable experiments.

Key Features

• 2‑hole rubber stoppers for laboratory applications
• Bottom diameter: 31mm
• Top diameter: 36mm
• Length: 35mm
• 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 31mm 2‑hole rubber bungs are well suited to KS3, GCSE, and A‑Level science lessons, particularly where larger‑scale apparatus and more complex experimental arrangements are required.

• Connecting gas delivery and outlet tubing in large reaction vessels
• Allowing simultaneous use of thermometers and delivery tubes
• Supporting gas generation and collection experiments
• Constructing advanced chemistry and physics apparatus
• Enabling safe, repeatable 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 modern educational environments.