It must be differentiated between the old line / series and the new line / series for the inkjet cartridges 51626A/G, 51629A/G, C6614D/N, 51645A/G and C6615D/N. The older series has been taken out of production several years ago, because these cartridges indicated significant signs of material fatigue and corrosion. Only the new line / series are suitable for high quality refilling. For this reason, we only purchase cartridges from the new series. You can easily differentiate by viewing the manufacturer's label on the front side of the cartridge:

Type HP 51626A und 51626G inkjet cartridge

Old series	Old series	New series	New series

Type HP 51629A und 51629G inkjet cartridge

Old series	Old series	New series	New series

Type HP C6614D und C6614N inkjet cartridge

Old series	New series	New series

Type HP 51645A und 51645G inkjet cartridge

Old series	New series	New series

Type HP C6615D und C6615N inkjet cartridge

Old series	New series	New series