Living · 6 pages · 12 min
Why a drain trap holds water
A bend in the pipe stays full of water so sewer gas cannot come up.
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From the opening
A drain trap is the bent section under a sink, tub, or floor drain that stays full after the water runs. That standing water is a seal, and sewer air on the far side of it cannot pass into the room unless something pushes the seal out. The opening covers the water that stays in the bend, what a dry trap lets through, and how a toilet bowl is a trap.
The rest of the brief — the later sections and the reading notes — opens after Stripe confirms payment.
Inside
- The water that stays in the bend
- What a dry trap lets through
- How a toilet bowl is a trap
- Why pressure can push the seal out
- Where the idea stops applying
- A distinction worth keeping
Sources
- The water seal in a P-trap
- Evaporation and siphonage of trap seals