Once the oil bottle is open, this plastic ring can actually be reused in a clever way: as a flow regulator.

If you’ve ever poured oil and accidentally dumped out more than you intended, this is where the cap insert comes in handy. When placed back into the bottle correctly, it slows and controls the flow of oil, making it easier to pour in small, manageable amounts.

How to Use the Ring Correctly

Here’s how to properly reuse the ring inside the cap:

Hold the ring between your thumb and forefinger.

Gently press it inward to slightly bend it.

Insert it into the neck of the oil bottle, pushing it past the outer rim and into the mouth of the bottle.

Inside, you’ll notice a large circular opening surrounded by plastic fins or prongs arranged radially — slide the ring into that area.

Once in place, the ring will narrow the opening, allowing oil to flow out more slowly and precisely.

Why This Trick Works

Without the insert, oil can pour too quickly, especially from large bottles. By putting the ring back in, you create a built-in pour spout that gives you better control and prevents spills or overuse — especially useful during cooking.

Conclusion

So next time you open a new bottle of oil, don’t toss that small plastic piece under the cap. It’s not just packaging waste — it’s actually a clever design feature that helps you pour smarter, waste less, and keep things cleaner in the kitchen.