47 mm XX10 047 00, XX10 047 20 and XX10 047 30 are glass filter holders . Use XX10 047 00 for getting a bacteriological analysis of water, using 47 mm sterile membrane filters. Its 47 mm depth filters are used for analyzing suspended solids in water. XX10 047 20 is used for bacteriological analysis applications where autoclaving filter holder with membrane is needed. XX10 047 30 is used in analysis of particulate contamination of oils and hydraulic fluids by gravimetric or particulate counting methods and exfoliative cytology applications. Do not use glass (XX10 047 00) and stainless screen (XX10 047 30) filter holders with flammable liquids. Use holder XX20 047 20, hydrosol stainless steel filter holder for flammable liquids.