| CPC B41J 2/1752 (2013.01) | 6 Claims |

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1. An attachment that is detachably mounted to a cartridge mounting unit of a printing apparatus, the cartridge mounting unit including a liquid introduction portion that receives a liquid, and a restricting mechanism that restricts a rotation movement of an incompatible cartridge in a rotation mounting direction to be mounted by interfering with the incompatible cartridge, the attachment comprising:
a release portion that releases restriction by the restricting mechanism by pushing a part of the restricting mechanism in a pre-determined insertion direction; and
a maintaining portion that maintains a mounted state of the attachment in cooperation with the cartridge mounting unit.
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