Please have a look at this support tutorial. I think you will find that the plastic piece is the cartridge latch which holds the ink cartridges in place.
HP DeskJet 6988 Replace Cartridge
Hello,
Yes, plastic cartidge holder is provided to you to store HP 337 (black inkjet print cartridge) as you remove it to install a new HP 338 ( Photo Cartidge).
Remember, below combination of Cartidges for used for specific purposes:
Black and color cartidge for general Printing of Documents.
Black, Color, Photo Cartidge to Print Photos.
Color cartidge , photo Cartidge and gray cartidge is specially used when you to print copies of photos with great quality.
I hope that this should resolve the issue for you.
You can mail me at [email protected] for further assistance, I'll be glad to help you.
Bye
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The cartridge latch and the plastic locking piece are different. This printer is inconsistent about lowering the locking piece to allow cartridge replacement. Very frustrating.
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