Consists of S.S. holders in mainfold of 3 of 6 to hold 47 m.m. dia,. membrane filters, The tops of the holders are connected to the outlets of the flushing tube with silicone tubing and glass stop cock. A vacuum resistant flask or woulf bottle must be placed between the manifold and vacuum pump. (Supplied without Wolfs Bottle and Vaccum/ Pressure Pump). These units are used for sterlity testing when the membranes filter is to be removed from the holder for incubation in culture media. Filtration areas is 12.5cm and has a holding capacity of 250ml. Though only vacuum is required for filleration, some pressure is required for flushing liquids.