The Fluval A157 is a two piece insert replacement that fits the following aquarium filter:
The Fluval Elite Stingray 15 Replacement Foam Filter consists of 1 piece fiber pad for the body and 1 piece foam for the tail of the Stringray 15 filter. This Fluval A157 combines mechanical and biological filtration to keep your aquarium clean and clear. This replacement aquarium filter should be changed every 2 weeks.
The Fluval A157 specifications: