Basin wastes and traps · Slotted and unslotted wastesSlotted and unslotted wastes
Slotted and unslotted wastes
Matched to the overflow.
If a basin has an overflow hole, it needs a slotted waste so the overflow can drain. If it doesn't, an unslotted waste is used.
- Overflow
- Slotted
- No overflow
- Unslotted
- Check
- Before ordering
- Common mistake
- Mixing them up
What it is
A slotted waste has openings in its side that line up with the basin's overflow channel; an unslotted waste is solid.
Good for
Overflow safety
A slotted waste lets the overflow work.
What to weigh up
Unslotted on an overflow basin
The overflow won't drain, and water can sit and smell.
No overflow
Basins without an overflow are often given an open, plugless waste, so they can never fill up and spill over.
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