May I ask, what is the name of the one in the picture? Where can I buy it and how much does it cost?

I forgot the name but I know that the medical equipment in the medical insurance city sells this at a price of 50-80 dollars or 20 dollars, but it is not recommended to buy it because the side is exposed to the air after two uses. You should go to the medical equipment stores that sell them, but they also sell them. The specific name I was thinking of half a day really forget seems to be what valve.