These printers use the C2P25AN cartridge:
Click On a Printer to View it's Cartridges
          HP OfficeJet 6812 E-All In One
          HP OfficeJet 6815 E-All In One
          HP OfficeJet 6820 E-All In One
          HP OfficeJet Pro 6220 E-All In One
          HP OfficeJet Pro 6230 E-All In One
          HP OfficeJet Pro 6830 E-All In One
          HP OfficeJet Pro 6835 E-All In One