EquipNet is the world's leading global provider of used cartridge filters and a variety of other preowned equipment. Our exclusive contracts with our clients yield a wide range of used cartridge filters from a number of respected OEMs, including Millipore, Parker, and many others. EquipNet is constantly receiving used cartridge filters of various makes, models, and sizes. EquipNet is constantly receiving used cartridge filters of various makes and models. If you do not see the used cartridge filters you are looking for, call one of our representatives and we will find it for you. We can also source the right tooling and change parts that you need through our huge network of corporate clients from around the globe.