how does this go up and down to act as a stopper?
347620
It's a push button. Push it down, it stays down, push on it again and it pops back up. We have it on a vessel sink that doesn't get used a lot so I can't tell you how it would hold up to a lot of action.
347621
Press it down manually with your finger. Press it once and it's closed, press it again and it's open.
1875219
It swings both ways but locks in place when shut. If you mean a piece like a stopper no.
470643
It will come down automatically. However, it is not spring loaded, but gravity will help it latch.
1954642
The end pieces move up and they can be used as stops, but I find they are a bit "wiggly" and seem cheaply constructed. I do not rely totally on them for stops; I clamp a piece of wood to the arm and make it as firm as possible. Maybe the one I got is not as well built as the ones used by the authors of the other two answers.
599681
The expands and gets smaller by twisting it. It might be spring loaded. It works well
1291738
The way it is made makes it naturally want to lay flat, so when you bring the two ends together and put it in a bag it springs back and the bag holds it. It's hard to explain in text, but it works.
1036815
It is started by inserting the stopper with it turned to hit the switch inside the barrel. The leading edge of the stopper is irregular and is very easy to use.
104599
It doesn't work like that. The paper feeds between a bar and the front piece (flat) that goes up and down. There is no pressure on the paper roll.
2130518
Mine doesn't go up all the way either but I think it's designed that way. It has not caused any problems for me as the bottom stays on without being hooked on at that point.
1580568
It will stop at two heights- all the way up and like halfway (one section collapsed). I don't know what to tell you if you need one with a handle that stops at exactly a certain height.
1150386
Just pull straight down. If dispensing, make sure the knobby piece is lined up in the track and push straight up.
1637014
You control the closing with your foot. Nothing automatically stops it, but it doesn't slam down abruptly either. Specially if you have a little trash bag, this softens the closing.
1780106
Watch the video on their web page, it show in detail how to do it. It's in there tight, but I like that it won't slip/fall out of the shell!
1005792
The pressure is steady. You settle in, tie your head down with the strap, then pump it to desired pressure, and it just keep pulling with that pressure until you release the air by pressing the release valve.
925328
Yes, this stopper works. But it breaks easily if you drop it and it lands on the stopper. I recommend using the cup over the stopper for transport or handling.
1575375
In the up postion. The pump is what takes the air out and then the button goes down a little.
1742809
It`s work like a primitive hand pump - move the upper part of this device up and down. For opening just pull it up.