and create a tighter seal beneath the glass.
Some people use paper towels instead of regular paper, while others prefer reusable silicone mats for the same purpose.
Why Place a Glass Upside Down?
The inverted glass helps trap air over the drain opening.
By reducing airflow, it becomes slightly more difficult for odors from the plumbing system to enter the room.
It also prevents insects from easily accessing the drain opening if they happen to travel through the plumbing system.
Although it isn’t completely airtight, it provides a surprisingly effective
