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The pipe installed for the purpose of ventilation is known as a vent pipe while a pipe which is installed in a house drainage to preserve the water seal of trap is an anti-siphonage pipe.
A J trap is normally tubular and a P trap is brass and does not swivel
Evaporation is the most common, syphoniage due to no vent or a block went is another cause or a leaking trap.
A P trap exits horizontal from the back of the toilet and a S trap exits vertical from the bottom of the toilet.
The difference between a gully trap drain and a floor drain is placement. A floor drain is in a floor, a gully trap drain goes on an external wall.