For 142 mm diameter membrane filters. With large capacity barrel allowing up to 2 litres of liquid to be filtered by connection to a suitable direct pressure source. For preparing sludge or separating suspended matter from waste water samples, or sterile filtration of liquids that are difficult to filter, e.g. serum. Filtration surface area: 130 cm². Maximum pressure 7 bar. The holder is supplied complete with a back pressure screen.