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Manifold funnels are manufactured either from highest grade stainless steel or from borosilicate glass 3.3.
Bottom part of the funnels has a membrane support.
All funnels are delivered without the silicone stopper and funnel clamp. These parts should be purchased seperately.
Manifold filter flask is manufactured from thick and heavy walled borosilicate glass 3.3 according to ISO 6556 and DIN 12476 standards.
This flask has a polypropylene side arm with a screw thread connector for easy and safe connection of the hoses.