Solid Rubber Stoppers (Bungs) – 38mm Bottom, Pack of 10

These Solid Rubber Stoppers (Rubber Bungs) are a heavy‑duty laboratory essential, designed for reliable use in school science classrooms and laboratories. Manufactured from high‑quality solid rubber, they provide a secure, airtight seal for larger laboratory vessels used during practical science activities.

Each stopper features a 38mm bottom diameter, a 42mm top diameter, and a 40mm length, ensuring a firm and stable fit in compatible flasks, bottles, and containers. Supplied in a convenient pack of 10, these durable bungs are reusable and well suited to frequent use in busy teaching and preparation areas.

Key Features

• Pack of 10 solid rubber stoppers
• Bottom diameter: 38mm
• Top diameter: 42mm
• Length: 40mm
• Manufactured from durable, high‑quality rubber
• Provides a secure and airtight seal
• Reusable and suitable for regular school laboratory use
• Ideal for larger laboratory glassware and containers

Ideal for School Science Lessons

These solid rubber bungs are ideal for KS3, GCSE, and A‑Level science lessons, particularly in chemistry and physics where larger vessels must be sealed securely. They support a wide range of practical classroom applications, including:

• Sealing large flasks and laboratory containers
• Conducting chemical reactions in closed systems
• Preventing spills during safe, controlled experiments
• Supporting demonstrations involving liquids and gases
• Ensuring consistent and repeatable experimental setups

Strong, dependable, and easy to use, these solid rubber stoppers are an essential component of any school science equipment collection, helping to maintain safety, organisation, and effective hands‑on learning in the laboratory.