Rubber Stoppers / Rubber Bungs – 2 Hole, Pack of 10 (33 mm Bottom Diameter)

These 2‑Hole Rubber Stoppers are high‑quality, chemically resistant bungs designed for securely sealing laboratory glassware while allowing the insertion of tubing, thermometers, or probes through the two pre‑drilled holes. Each stopper features a bottom diameter of 33 mm, tapering to a top diameter of 38 mm, with a length of 38 mm, making them suitable for wider‑neck flasks, bottles, and reaction vessels.

Supplied in packs of 10, these stoppers are manufactured from durable, flexible rubber that withstands repeated use and exposure to common laboratory chemicals—ideal for school science departments and routine laboratory setups.

Key Features

• Pack of 10 2‑hole rubber bungs
• Bottom diameter: 33 mm
• Top diameter: 38 mm
• Length: 38 mm
• Two precision‑cut holes for tubing or probes
• Durable, flexible, and chemical‑resistant rubber
• Provides a reliable, leak‑resistant seal for wide‑neck glassware

Ideal for School Science Lessons

Perfect for KS3–KS5 chemistry and biology, these 2‑hole stoppers are excellent for:

• Gas collection and delivery setups
• Creating sealed systems with inlet/outlet tubing
• Reaction vessels requiring probes or thermometers
• Demonstrations involving gas evolution, respiration, or pressure changes
• Any practical where safe and secure sealing is essential

Strong, versatile, and classroom‑ready, these 2‑hole rubber bungs are a core consumable for any school laboratory.