The Hagen A134 fits the following filters:
The A134 - Marina I25 Replacement Media Cartridge is specially designed to fit the Marina i25 internal filter and provide aquariums with clean water. The Marina i25 filter media allows for the flow of water through the center part of the cartridge, resulting in dual filtration through two chambers. The Marina cartridge features a zeolite chamber that removes toxic ammonia and an activated carbon chamber that removes pollutants and odors. This replacement filter media also has a floss layer that helps trap leftover debris.
A134 - Marina I25 Replacement Media Cartridge specifications: