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A U-shaped bend in a drain line.
Also known as: P trap symbol, Drain trap symbol
The plumbing drawing symbol for a trap, the water-filled bend that seals a drain against sewer gas.
Draws the bend itself, because the trap works by holding water in that bend, so the symbol shows the mechanism and not merely the fitting. It is the drain trap, distinct from the steam trap the catalogue already holds.
Contexts: Technical drawing
A U-shaped bend drawn in the drain line, the curve dipping below the line either side of it.