These printers use the C2P26AN cartridge:
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