The analytical funnel has a plug in its receiver which prevents the filter paper from sticking, thus enabling rapid filtration.– For quick filtration – The inserted glass bars make it ideal for fast filtration using paper round filters – Fired-on, highly durable white print – – The analytical funnel has a plug in its receiver which prevents the filter paper from sticking, thus enabling rapid filtration.– For quick filtration – The inserted glass bars make it ideal for fast filtration using paper round filters – Fired-on, highly durable white print – –