Oil, NEVER throw away this part of the cap: it's very important, that's exactly what it's used to.

You must put the small piece you removed into the oil bottle.
As already mentioned, the small piece you have removed from the cap should be put back in the bottle. Before putting it on, take the ring between your forefinger and thumb, press lightly and place the ring first at the bottom of the oil bottle.

As you can see on the bottle, there is an opening inside, where you have to pass the ring. The opening is quite large and is surrounded by many plastic parts arranged in a radial pattern. If the bottle is used as such, the oil comes out in large quantities.

After placing the ring at the bottom of the oil bottle, place the top plate of the plastic part firmly.

When placing the piece of cork in the bottle, you need to make sure that the entire piece is placed so as to cover the large crack that existed before. If it is placed correctly, you will only see three small cracks.

Its function is to perfectly dose the oil.
Press the part you put in the oil bottle and with the three small slits you will get a perfect dosage when used.

It is true, this little piece that we are used to removing and throwing, if you put it back in the bottle as I explained earlier, will allow you to taste the oil by measuring it perfectly, and when you have to put it in the furnace, you will no longer need to be impatient to want to serve a little. The oil will be sorted in small doses for all three locations and you can use it without waste.

You will never use more than you need.
With this ingenious piece inside the oil bottle that you find immediately when you open the cap, you will never add more oil than you actually need to cook.

This is a very useful mechanism to avoid wasting oil and using it in an appropriate quantity. From now on, you will no longer throw away this bottle cap of oil and you will certainly use it because it will save you money.