Basins and vanity units · Basin wastes and traps

Basin wastes and traps
How the basin drains.

Every basin has a waste in the bowl and a trap below to stop drain smells. The right waste depends on whether the basin has an overflow.

The basics

The waste is the plug fitting in the basin; the trap holds a little water below to block smells from the drain.

Slotted for basins with an overflow, unslotted for basins without.

Press the plug to open and close it.

Opened by a lever on the tap.

A neat trap under the basin, often on show under wall-hung basins.

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Illustrations are concepts, not measured plans. Click any picture to enlarge it.