I need your help with an EVAP problem

In my Ranger from 2001 the error P0442 still appears and although I have already replaced the valves and have already replaced the tank cap twice and closed the connections, the error keeps coming back after 60-150ML now I have discovered a “device” in the line that I do not know. It sits in the frame at the end of the tank and has a plug. It is almost impossible to get to the device, which is why the picture is not so good.
Who can tell me what it is and what it is called?
Greetings Olds1
Thanks for your help already

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Hello,
now I have better pictures of the part I don't know.
Who can help me and tell me what it is and what it is called.
Greetings Olds1