physical, liquid seal. It is what blocks heavy, smelly sewer gases from floating up the pipe and into your bathroom or kitchen. It also blocks drain flies and bugs.
Why the Glass Hack Fails
Placing an upside-down glass or a plastic bag over the drain does absolutely nothing to stop sewer gas, because it doesn’t create an airtight seal. Gases will simply find a way around the edges. Furthermore, if you use a plastic bag and a rubber band, you’re just creating a messy, sticky trap for hair and gunk
The Real Deal on Covering Your Sink Before Vacation: The Truth About the “Upside-Down Glass” Hack (And How to Actually Protect Your Home)
