
Listen to this fragment first

Hint 1
Fill the watering can with water via the water pump. Then pour this water into one of the holes and see what happens in the greenhouse.
Hint 2
If you pour water into the right tube, a color will come up between the plants.
Hint 3
There are numbers on the tubes. First find out which tubes bring up a color in the greenhouse. You can find out the order by the colors that come up in the greenhouse. Red = number 1, blue = number 2, green = number 3 and yellow = number 4
Answer
The code is 6274.