Rubber Stoppers / Rubber Bungs – 1 Hole, 13mm (Pack of 10) [1187]

These high‑quality 1‑Hole Rubber Stoppers are designed to provide a secure, airtight seal for a range of laboratory glassware used in school science experiments. With a 13mm bottom diameter, 16mm top diameter, and a length of 24mm, they are ideal for smaller test tubes and vessels.

Each stopper includes a single pre‑drilled hole, perfect for inserting glass or plastic tubing for gas delivery, collection, or controlled experimental setups. Manufactured from durable, chemical‑resistant rubber, these stoppers are suitable for repeated use in busy educational environments.

Supplied in convenient packs of 10, these rubber bungs are ideal for class practicals, group work, and routine laboratory investigations.

Key Features

• Durable rubber stopper with 1 pre‑drilled hole
• Bottom diameter: 13mm
• Top diameter: 16mm
• Length: 24mm
• Provides a snug, airtight seal for laboratory glassware
• Suitable for inserting glass or plastic tubing
• Chemical‑resistant and designed for repeated classroom use
• Supplied in packs of 10

Ideal for School Science Lessons

These 1‑hole rubber bungs are ideal for KS3, GCSE, and A‑Level practical work, supporting a range of experiments involving gas collection, water displacement, closed systems, and controlled reactions.

• Setting up gas delivery systems safely and securely
• Sealing small test tubes in closed‑system chemistry investigations
• Supporting experiments such as respiration, fermentation, or gas evolution
• Allowing controlled insertion of tubing for gas transfer or collection
• Ensuring safe, leak‑free use of school laboratory glassware

Reliable, practical, and essential for science experiments, these 13mm rubber stoppers are a staple consumable for any school laboratory.