Note: 3 different units shown in above photo: 

> Natural color 30mm diameter units (Cat. #540100)
   Use 25mm diameter filters
 
> Blue color 63.5mm diameter units (Cat. #501200 and Cat. #501300 shown)
   Use 47mm diameter filters

• Ultraclean and sterilize liquids
• Aseptic sampling of liquids or gases at point-of-use 
• Environmental air sampling (Cat. #501300, Model PPO 47)

• Compatible with a wide range of chemicals and temperatures
• Exterior locking ring design allows the unit to be assembled quickly and efficiently without tearing the membrane