For membrane filter analysis. Can also be used to perform pressure filtrations. Conforms to APHA standards for water-quality work. Presterilized, non-toxic, disposable. Capacity: 115 ml. Made of polystyrene. Cups marked at 100 ml; receivers graduated from 20 to 115 ml. Membranes have 47 mm diameter, are triton-free and non-toxic. Not for in-vitro diagnostic use.