Rubber Cone Int. 40/27 – Ext. 46/32mm for Flask Neck 39/44 (Model 2165)

This high‑quality Rubber Cone Adapter is designed for secure use with Büchner Funnels, offering a convenient alternative to boring oversized holes in rubber bungs. The cone forms a tight, reliable seal around the tapered base of the funnel rather than the stem, ensuring stability and preventing air leaks during filtration.

It is important to select the adapter based on the flask neck size rather than the funnel stem diameter. This model is suitable for Flask Neck 39/44 and features internal dimensions of 40/27mm and external dimensions of 46/32mm. Each unit is sold individually, making it ideal for both classroom and professional laboratory filtration setups.

Key Features

• Designed for use with Büchner Funnels without modifying bungs
• Forms a secure seal around the funnel’s tapered base
• Compatible with Flask Neck 39/44
• Internal size: 40/27mm
• External size: 46/32mm
• Provides excellent airtight performance for vacuum or gravity filtration
• Priced in single units

Ideal for School Science Lessons & Laboratory Use

This rubber cone adapter is ideal for KS3, GCSE, and A‑Level chemistry, supporting safe and effective filtration techniques. It ensures a reliable seal, helping students perform practical separation and purification tasks with confidence.

• Vacuum filtration in organic and inorganic chemistry
• Separation and purification practicals
• Teaching correct technique for reduced‑pressure filtration
• Providing safe, airtight sealing without modified bungs
• Technician preparation of filtration setups for lessons

Reliable, durable, and essential for filtration work, this Rubber Cone Adapter provides a secure and consistent connection between Büchner funnels and flasks in both educational and professional laboratories.