For Pascal, DuoLine™, UnoLine Plus, The external oil filter is operated in the oil circuit of rotary vane pumps, DE 1 Filter includes 1 cartridge. Factory supply is an activated alumina cartridge, Furthermore, cartridges with cellulose and activated charcoal are available, Application activated alumina, Mineral acids, Lewis acids, polar media, Standard factory installed cartridges are activated alumina, Applications activated charcoal, Chlorine and chlorinated media, nitrous vapor, ammonia, Replacement cartridge cellulose (for USA), Order number, 12633, Customer benefits, Longer service life of the operating fluid, longer pump lifetime, Applications cellulose, Filtration of particles from operating fluid