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A circle in plan marking a vertical drainage stack.
Also known as: SVP plan symbol, Drainage stack symbol, Soil stack symbol
On a building plan a soil vent pipe is drawn as a circle where the vertical drainage stack passes through the floor, carrying waste down and air up.
Denotes a vertical drainage stack passing through the floor.
Contexts: Technical drawing
Carries air as well as waste, the vent preventing the pressure changes that would otherwise siphon water out of the traps below.
Contexts: Technical drawing
A circle drawn where the pipe passes through the floor, often with a short label beside it.
A fuller structured visual breakdown is not yet documented for this symbol.