Rubber Stoppers (Bungs) with 1 Hole – 38mm Bottom, Pack of 10

These Rubber Stoppers (Rubber Bungs) with One Hole are a durable and practical laboratory accessory, ideal for use in school science classrooms and laboratories. Designed to form a tight seal while allowing tubing or instruments to pass through, they are well suited to a wide range of controlled experiments.

Each stopper features a 38mm bottom diameter, a 42mm top diameter, and a 40mm length, making them suitable for larger laboratory vessels such as flasks and bottles. The single pre‑formed hole allows easy insertion of delivery tubes, thermometers, or probes. Manufactured from high‑quality rubber, these bungs are reusable, robust, and supplied in a convenient pack of 10 for classroom or prep room use.

Key Features

• Pack of 10 rubber stoppers with 1 pre‑drilled hole
• Bottom diameter: 38mm
• Top diameter: 42mm
• Length: 40mm
• Allows insertion of tubing, probes, or thermometers
• Made from durable, flexible rubber
• Provides a secure and airtight seal
• Reusable and suitable for regular school laboratory use

Ideal for School Science Lessons

These one‑hole rubber bungs are ideal for KS3, GCSE, and A‑Level science lessons, particularly in chemistry and physics where sealed systems and controlled measurements are required. Typical classroom applications include:

• Fitting delivery tubing for gas collection experiments
• Inserting thermometers or sensors into reaction vessels
• Creating closed systems for safe chemical reactions
• Supporting experiments involving temperature, pressure, or gas production
• Ensuring consistent and repeatable experimental setups

Strong, reliable, and easy to use, these one‑hole rubber stoppers are an essential component of any school science equipment collection, helping to support safe, effective, and engaging hands‑on learning in the laboratory.