Rubber Stoppers (Bungs) with 1 Hole – 15mm Bottom, Pack of 10

These Rubber Stoppers (Rubber Bungs) with One Hole are a versatile and essential laboratory consumable, ideal for use in school science classrooms and prep rooms. Designed to provide a secure seal while allowing tubing or glassware to pass through, they are commonly used in gas, liquid, and pressure‑based experiments.

Each bung features a 15mm bottom diameter, 18mm top diameter, and a 24mm length, ensuring a snug and reliable fit in compatible test tubes and flasks. The pre‑formed single central hole allows easy insertion of delivery tubes or thermometers. Made from durable rubber, these stoppers are reusable and suitable for repeated classroom use. Supplied as a pack of 10, they are ideal for group practical work.

Key Features

• Pack of 10 rubber stoppers with 1 pre‑drilled hole
• Bottom diameter: 15mm
• Top diameter: 18mm
• Length: 24mm
• Single hole allows insertion of tubing or glass rods
• Manufactured from durable, flexible rubber
• Provides a secure, airtight seal
• Reusable and suitable for regular school 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 controlled gas or liquid transfer is required. Typical classroom uses include:

• Fitting delivery tubes for gas collection experiments
• Sealing flasks during chemical reactions
• Supporting investigations involving air pressure or gas flow
• Creating closed systems for safe practical demonstrations
• Enabling accurate and repeatable experimental setups

Practical, robust, and highly adaptable, these one‑hole rubber stoppers are an essential part of any school science equipment collection, helping to support safe, engaging, and effective practical science learning.