hp 777HP 777 Desnjet Maintenance Cartridge 3ED19A - [PRS-70018HP 777 DesnJet Maintenance Cartridge (3ED19A) HP 777 DesnJet Maintenance Cartridge (3ED19A) Compatibilities. HP DesnJet Z6 Pro 64-in Printer. HP DesnJet Z9+ Pro 64-in