Robin

Regular G or J tubes have a long tube dangling out the front.
Buttons or skin level devices do not.
I did not realize that you were talking about a J or Jejunum tube. Those tubes go into the small intestine.
J tubes require a special type of "button". Here is a link to one woman's J button story J button
Here is a link to pictures of the two most popular G or gastronomy"buttons". They go directly into the stomach Mickey vs AMT button

As you can see, the J button has a tube on the inside since the intestine does not have the storage of the stomach. The G button has no tube. Both use a balloon to hold it in.

There are also combo J and G tubes. J tubes almost always require very slow feed drip with a pump. You need a tube first to let the stoma heal properly before you can get a button
Charm