How exactly does the Tapper work?

The tooltip on the Tapper says, "Place on a maple, oak, pine or palm tree and wait for the reservoir to fill with product!"

When it says on, does it literally mean on the same square as the stump of the tree? Or do I need to place it in an immediately adjacent square? I've done the former, but after several days have seen no results. Am I doing something wrong?

Solution 1:

You need to place the Tapper on the tree, and it needs to be on a fully grown tree (aka no stumps).

Prices and production time will vary based on the tree you attached it to, but it can take up to 8 days. I've included screenshots below showing the prices and production time of the different products (source), as well as an image showing the three different trees you can tap.