Rubber Cone Int. 27/18 – Ext. 32/24mm for Flask Neck 25/27 (Model 2163)

This durable Rubber Cone Adapter is designed for use with Büchner Funnels, offering a reliable alternative to drilling large holes in rubber bungs. The cone forms a secure seal around the tapered base of the funnel rather than the stem, ensuring a stable and airtight connection during filtration.

It is essential to choose the cone based on the flask neck size, not the funnel stem. This model fits Flask Neck 25/27 and features internal dimensions of 27/18mm and external dimensions of 32/24mm. Each cone is priced individually and is ideal for school and laboratory filtration setups.

Key Features

• Designed for secure sealing with Büchner Funnels
• Forms seal around the funnel’s tapered base for improved stability
• Compatible with Flask Neck 25/27
• Internal size: 27/18mm
• External size: 32/24mm
• Ensures airtight performance during vacuum or gravity filtration
• Supplied and priced in single units

Ideal for School Science Lessons & Laboratory Use

Perfect for KS3, GCSE, and A‑Level chemistry, this rubber cone supports safe and efficient filtration by providing a reliable seal without the need for modified bungs. Ideal for lessons and technician preparation, it helps students develop essential laboratory skills.

• Vacuum filtration in organic and inorganic chemistry
• Purification and separation experiments
• Demonstrating correct reduced‑pressure filtration technique
• Ensuring stable and airtight connections for improved safety
• Technician‑led setup of filtration apparatus

Practical, durable, and essential for filtration work, this Rubber Cone Adapter ensures safe, effective, and high‑quality performance in school and professional laboratories.