This module is equipped with 1-1/4" Slip by 1" Slip fittings. It may be adapted to fit any size plumbing up to 1" using reducer bushings. Lifegard modular filters are easy to assemble using standard PVC fittings which we sell online. Any combination of modules can be strung together to form a complete filtration system. These systems can be run by an external water pump. Many hobbyists use modular filters in the return line from their aquarium reservoir for various applications. The Lifegard AF-Series Chemical Filters are available in three sizes, Single, Double or Triple capacity. Single Capacity Chemical Filter: holds 7.3 oz. (207 grams) of filter media. Double Capacity Chemical Filter: holds 15.6 oz. (422 grams) of filter media. Triple Capacity Chemical Filter: holds 24.4 oz. (692 grams) of filter media. Inlet is 1 1/4" slip and outlet is 1" slip. Dimensions are 14" High X 7" Wide X 4 3/4" Deep. Recommended aquarium size is up to 100 Gal.