Rubber Stoppers / Rubber Bungs – Solid, Pack of 10 (31 mm Bottom)

These Solid Rubber Stoppers are durable, chemically resistant bungs designed for sealing a wide range of laboratory glassware. Each stopper features a bottom diameter of 31 mm, tapering to a top diameter of 36 mm, with a length of 35 mm. Supplied in packs of 10, they provide a secure, leak‑resistant fit ideal for routine use in busy school science laboratories.

Manufactured from strong, flexible rubber, these stoppers withstand repeated handling and exposure to common laboratory chemicals, making them dependable for everyday experiments and demonstrations.

Key Features

• Pack of 10 solid rubber stoppers
• Bottom diameter: 31 mm
• Top diameter: 36 mm
• Length: 35 mm
• Strong, flexible, and resistant to chemical wear
• Provides a tight, secure seal for larger laboratory vessels
• Reliable for repeated classroom use

Ideal for School Science Lessons

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

• Sealing flasks, beakers, and wide‑neck tubes
• Preventing gas escape during controlled reactions
• Safely storing solutions or samples
• Supporting mixing, heating, and general practical work

These robust stoppers are an essential addition to any school science lab, offering reliable sealing for a wide variety of practical investigations.