The Hagen A1387 pre-filter is used with the following:
The Fluval A1387 Edge Pre-Filter Sponge Replacement is a pre-filter sponge used with the Fluval Edge Power Filter. This Fluval prefilter captures small and fine debris for biological filtration. This aquarium sponge filter covers the filter intake stem easily to prevent the small inhabitants of your tank from being drawn in.
Fluval A1387 Edge Pre-Filter Sponge Replacement specifications: