Rubber Stoppers / Rubber Bungs – Solid, Pack of 10 (33 mm Bottom)

These Solid Rubber Stoppers are high‑quality, chemically resistant bungs designed for sealing larger laboratory vessels with a secure, airtight fit. Each stopper features a bottom diameter of 33 mm, tapering to a top diameter of 38 mm, with a length of 38 mm. Supplied in packs of 10, they are ideal for use with flasks, wide‑neck tubes, and other large‑mouth laboratory glassware.

Made from tough, flexible rubber, these stoppers provide excellent durability and repeatable performance in busy school science environments. Their snug fit helps prevent leaks, spills, and gas escape during practical work.

Key Features

• Pack of 10 solid rubber stoppers
• Bottom diameter: 33 mm
• Top diameter: 38 mm
• Length: 38 mm
• Durable, flexible, and chemical‑resistant rubber
• Provides a tight, reliable seal for wide‑neck laboratory vessels
• Suitable for repeated classroom use

Ideal for School Science Lessons

Perfect for KS3–KS5 chemistry, these larger rubber bungs are ideal for:

• Sealing flasks and large reaction vessels
• Preventing gas escape during demonstrations
• Storing solutions and samples securely
• Supporting heating, mixing, and containment activities

A versatile and dependable addition to any school laboratory, ensuring safe and effective sealing across a wide range of practical investigations.