These printers use the C6614 cartridge:

HP DeskJet 610

HP DeskJet 610 C

HP DeskJet 610 CL

HP DeskJet 612

HP DeskJet 612 CL

HP DeskJet 612 C

HP DeskJet 630 C

HP DeskJet 632 C

HP DeskJet 640 C

HP DeskJet 642 C

HP DeskJet 648 C

HP DeskJet 650 C

HP DeskJet 656 C

HP DeskJet 656 CVR

HP FAX 925 XI

HP FAX 1010

HP FAX 1010 XI

HP FAX 1020

HP FAX 1020 XI

HP FAX 1040

HP FAX 1040 XI

HP FAX 1050

Apollo P 2100 U

Apollo P 2100 U Series

Apollo P 2150 U

Apollo P 2200

Apollo P 2200 Series

Apollo P 2250

Apollo P 2300 U Series

Apollo P 2350 U Series

Apollo P 2500 P Series

Apollo P 2500 U Series

Apollo P 2600 P Series

Apollo P 2600 U Series

Apollo P 2800

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