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Frequently Asked Questions
How does it seal without water?
With a mechanical closure.
A flexible membrane, sleeve or flap.
It opens under the weight of water.
And closes behind it as flow stops.
Nothing is retained between uses.
What failures does that remove?
Evaporation and siphonage.
Both are simply absences of water.
A conventional trap can suffer either.
While being intact and correctly fitted.
There is nothing here to lose.
Where is it most useful?
Outlets that sit unused for long periods.
Plantroom and laundry floor drains.
Guest and holiday bathrooms.
Buildings empty for a season.
Anywhere a seal would be gone on return.
What is the drawback?
A moving part in a wet, dirty place.
Debris can hold the membrane open.
Grease can stop it closing cleanly.
And it perishes with age.
None of which is visible.
Is it accepted everywhere?
No, and this varies considerably.
Some jurisdictions permit it as a trap.
Others only alongside one.
Others not at all.
Confirm locally before specifying.