Rubber Stoppers / Rubber Bungs – 1 Hole, Pack of 10 (Bottom 11mm) [2668]

These 1‑hole rubber stoppers (rubber bungs) are designed for reliable sealing of laboratory glassware while allowing tubing, thermometers, or delivery tubes to be inserted through the centre. Supplied as a pack of 10, they are ideal for routine use in school science laboratories, prep rooms, and teaching environments.

Each stopper has a bottom diameter of 11mm, a top diameter of 14mm, and a length of 24mm. The tapered design ensures a secure, flexible fit in appropriately sized test tubes and flasks. Manufactured from durable laboratory‑grade rubber, these stoppers provide good grip, resilience, and resistance to common laboratory chemicals.

The single pre‑formed hole allows controlled passage of apparatus while maintaining an effective seal, making these rubber bungs ideal for gas collection, temperature measurement, and simple reaction setups.

Key Features

• Pack of 10 rubber stoppers
• 1 hole for tubing or probes
• Bottom diameter: 11mm
• Top diameter: 14mm
• Length: 24mm
• Tapered shape for a secure, snug fit
• Manufactured from durable laboratory‑grade rubber
• Suitable for test tubes, flasks, and small vessels

Ideal for School Science Lessons & Laboratory Use

These 1‑hole rubber stoppers are ideal for KS3, GCSE, and A‑Level science lessons, supporting a wide range of practical activities that involve sealed systems and simple apparatus connections.

• Gas collection and delivery experiments
• Inserting thermometers or delivery tubes into flasks
• Supporting chemistry and physics practical investigations
• Teaching correct selection and use of laboratory accessories
• Providing reliable consumables for prep rooms and classrooms

Practical, durable, and versatile, these 1‑hole rubber stoppers are an essential laboratory consumable that supports safe, effective, and hands‑on science teaching in educational settings.