water seal

noun

a small amount of water contained in the trap of a drain to prevent the passage of foul smells

To make a trap with what is known as a water-seal, the U pipe is turned into an S fallen forward, .

These ash-pits are themselves provided with an overflow consisting of a siphon-tube forming a water-seal.

Both tubes were connected to a water seal bottle, and the dressing was applied.

At S and T are glands which provide a water seal against the inleakage of air and the outleakage of steam.

The water seal in the traps may evaporate, and thus give direct sewer-air connection with the house.

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