Rubber Stoppers (Bungs) with 2 Holes – 40mm Bottom, Pack of 10

These Rubber Stoppers (Rubber Bungs) with Two Holes are a robust and highly versatile laboratory accessory, ideal for use in school science classrooms, laboratories, and preparation rooms. Designed to provide a secure, airtight seal while allowing multiple connections, they are perfect for more advanced or multi‑step practical experiments.

Each stopper features a 40mm bottom diameter, a 49mm top diameter, and a 40mm length, making them suitable for sealing larger flasks, bottles, and laboratory vessels. The two pre‑formed holes allow the simultaneous insertion of delivery tubing, thermometers, sensors, or probes. Manufactured from durable, high‑quality rubber, these bungs are reusable and supplied in a convenient pack of 10, ideal for class practicals and demonstrations.

Key Features

• Pack of 10 rubber stoppers with 2 pre‑drilled holes
• Bottom diameter: 40mm
• Top diameter: 49mm
• Length: 40mm
• Supports insertion of multiple tubes, probes, or thermometers
• Manufactured from durable, flexible rubber
• Provides a secure and airtight seal
• Reusable and suitable for regular school laboratory use

Ideal for School Science Lessons

These two‑hole rubber bungs are ideal for KS3, GCSE, and A‑Level science lessons, especially in chemistry and physics where more complex experimental systems are required. Common classroom applications include:

• Conducting gas collection and transfer experiments
• Using delivery tubing and thermometers simultaneously
• Creating closed reaction systems for safe investigations
• Supporting experiments involving pressure, temperature, or gas flow
• Ensuring accurate, repeatable, and well‑controlled practical setups

Strong, adaptable, and easy to use, these two‑hole rubber stoppers are an essential addition to any school science equipment collection, supporting safe, organised, and high‑quality hands‑on science learning.