Hey /diy/, excuse me for posting such a (probably) simple question.

File: 20160224_214306.jpg (548KB, 2240x1344px) Image search: [Google]

548KB, 2240x1344px

Hey /diy/, excuse me for posting such a (probably) simple question. This is the first time I ever post on here because I think you might be able to tell me what's wrong.
(I hope this thread won't get deleted, I'm a bit desperate about this desu)

So, I got a new bike and it came with a weird pump. I can't use my own pump on the ventile :/
In the picture you can see it, I just put the parts of it next to it to make its structure visible.

Well, the pump fits the ventile but I cannot use it.
When I saw it first, I thought there would be something missing, the part you push and pull, you know?

Am I right? Is it missing or am I doing something wrong?

Sorry again for this stupid question but I'm not very familiar with pumps.

Oh and I also don't know what this chop is for?

Thank you in advance :)