Although modern plumbing has improved significantly, many homeowners still use this trick because it’s inexpensive, easy to do, and offers an extra layer of protection.
Why Cover the Sink Drain
Before Leaving?
Your kitchen sink drain connects directly to your home’s plumbing system.
Normally, a U-shaped pipe beneath the sink—called a P-trap—holds water that acts as a barrier between your home and the sewer system. This water prevents unpleasant gases from traveling back up through the drain.
However, if a home sits unused for an extended period, especially in warm or dry climates, some of that water can slowly evaporate. When the water level drops too low, odors may begin to enter the kitchen.
Covering the drain creates another physical barrier that can help reduce airflow and slow the movement of odors into the room.
