Bio Technik Filter Holder

? These Filter Holder for vacuum filtration accept 47 mm diameter filters. the filter support is stainless steel screen ? The ring allows autoclaving with a filter in position without stick age of the filter to the support, and also protects from breakage. it has a rim around the upper edge to simplify the positioning of the funnel and to avoid displacement of the filter. And a silicon O-Ring in the avoid. ? The screen fits between top and base part, and the whole is held together with a practical hand clamp. ? The holders are supplied with a silicone lid, but without a bored stopper to fit them onto a suction Flask. Such a stopper must be additionally ordered according to the diameter required.