2 Per Pack Quality Made in the USA Cartridges New from Factory (Please scroll to see full detail) Product Description Replaces the following filters: -Pentair Pool Products -Rainbow Plastics -South Pacific and other manufacturers Measurements: Length: 13 - 5/16" Outside Diameter: 4 - 15/16" (Also replaces 5") Top Opening: Closed Bottom Opening: 2 - 1/8" Other popular brand part numbers Unicel - C-4321 C4321 Filbur - FC-2372 FC2372 Pleatco - PRB25-IN-TC Manufacturer of this cartridge: Guardian Filtration Products (USA) Part number 413-104 Single Large quantity discount Other cartridge sizes