Cartridge seal is an assembled set of seal. It is highly known for design. Cartridge design is very much helpful in fitting the seal because of its prior setting. It has two types
Single Cartridge Seal
Double Cartridge Seal
PTFE Bellow Seal is an outside mounded seal. It is used for its unique property .i.e. used in acid medium also. It is a directed seal hence used in both the side.