Cartridges are the inner parts of your pumps that allow for the pumps to properly function. When a pump is not working properly or in need of repairs it is usually due to the need of a replacement cartridge. Cartridges can stop working for many reasons; most cases are due to overheating. Canarsee’s line of Taco Pump Cartridges are easy to install and made to last, including cartridges for the most popular Taco Pumps such as Taco 003, Taco 006 Bronze, and Taco 007.