Specifically designed for the Fluval U4 filter, the U4 Bio-Foam Pad captures large particles and debris for effective mechanical filtration. 
Features: 
- Mechanical filter media
 
- Fits perfectly inside the filter chamber to prevent debris from escaping
 
- Ideal pore size allows efficient water flow, less clogging and long-lasting filtration
 
- Suitable for freshwater, saltwater or reptile environments
 
- Convenient 2-pack format
 
Compatibility: 
Item #: A488