The funnel head of the filter funnel head is to hold the solution to be filtered.– Exchangeable filter head according to the filtrate volume – with Thread – Easy-to-read scale with graduation marks to estimate the content – Fired-on, highly durable white print – The funnel head of the filter funnel head is to hold the solution to be filtered.– Exchangeable filter head according to the filtrate volume – with Thread – Easy-to-read scale with graduation marks to estimate the content – Fired-on, highly durable white print –