Rubber Stoppers / Rubber Bungs – 1 Hole, 19mm (Pack of 10) [1160]

These high‑quality Rubber Stoppers (1 Hole) are designed for secure and reliable sealing of laboratory glassware. With a 19mm bottom diameter, 22mm top diameter, and a length of 28mm, they provide a snug, airtight fit for a range of test tubes, flasks, and other science lab vessels.

Each stopper features a single pre‑drilled hole, making it suitable for inserting glass or plastic tubing for gas delivery, liquid transfer, or closed‑system experiments. Manufactured from durable, chemical‑resistant rubber, these bungs are ideal for repeated use in busy school laboratories.

Supplied in convenient packs of 10, these rubber stoppers are perfect for class sets, group work, and practical science demonstrations.

Key Features

• Durable rubber stopper with 1 pre‑drilled hole
• Bottom diameter: 19mm
• Top diameter: 22mm
• Length: 28mm
• Suitable for glass or plastic tubing insertion
• Provides a secure, airtight seal
• Resistant to common laboratory chemicals
• Supplied in packs of 10

Ideal for School Science Lessons

These 1‑hole rubber bungs are perfect for supporting a wide range of KS3, GCSE, and A‑Level practical activities. They allow students to design and carry out experiments safely using closed systems or controlled gas flow setups.

• Setting up gas delivery systems in chemistry experiments
• Creating closed reaction vessels for observing gas production
• Supporting distillation, respiration, and fermentation investigations
• Helping students understand pressure, gas movement, and reaction control
• Ensuring safe, spill‑free use of laboratory glassware

Strong, reliable, and classroom‑ready, these rubber stoppers are an essential consumable for any school science laboratory.