4. Connect the Pieces Together
Even though the hole you cut was a bit narrower than the pipe, you should be able to push your pipe through it relatively easily.
The hole will naturally expand as the pipe is introduced. This is the reason that you did not make the hole any bigger.After all, you want the pipe to have a snug fit.
After the pipe has been pushed about an inch into the cap, you will screw the cap onto the plastic bottle. As you can see, this will result in the end of your siphoning pipe being placed inside the bottle.