Rubber Stoppers / Rubber Bungs - Solid, 17 mm (Pack of 10)

These high-quality solid rubber stoppers are designed for secure sealing of laboratory glassware, ensuring a tight, reliable fit during experiments. Each bung has a 17 mm bottom diameter, 20 mm top diameter, and a 26 mm length, making them ideal for use with a wide range of test tubes, flasks, and other lab vessels.

Made from durable, chemical-resistant rubber, these stoppers provide excellent sealing performance and are suitable for everyday use in school science laboratories and prep rooms. Supplied in a convenient pack of 10, they are an essential consumable for any teaching environment.

Key Features

• Solid rubber bungs - no holes
• Bottom diameter: 17 mm
• Top diameter: 20 mm
• Length: 26 mm
• Pack of 10 for classroom convenience
• Durable and chemical-resistant
• Provides a tight, secure seal on laboratory glassware
• Suitable for repeated school-laboratory use

Ideal for School Science Lessons & Practical Activities

These solid rubber stoppers are perfect for use across KS3, GCSE, and A-Level Science. They support a variety of practical activities where sealing containers safely is essential, including:

• Sealing test tubes, flasks, and boiling tubes during experiments
• Preventing spills or evaporation of liquids
• Containing gases during simple reactions
• Supporting demonstrations in biology, chemistry, and physics
• General prep room use for equipment storage and experiment setup

Reliable, robust, and versatile, these 17 mm solid rubber stoppers are an essential addition to any school science laboratory.