Slotted or unslotted?
Look inside the basin for the overflow hole near the top. If there is one, water from it travels down inside the basin to the waste hole, so the waste needs slots to let it in — a slotted waste. No overflow means an unslotted waste. Using the wrong type makes the overflow useless or causes leaks.
Step by step
- Clean the waste hole.
- Fit the top rubber seal under the waste flange (or silicone if instructed).
- Push the waste down through the hole. Line the slots up with the overflow channel.
- From below, fit the rubber washer, the plastic washer and the back nut.
- Tighten while holding the top steady.
- Fit the trap and connect to the waste pipe.
- Fill the basin to the overflow, then pull the plug and check for drips.
Pro tip: Two seals: one on top under the flange, one underneath. Solid basin between them both. That stops water escaping around the waste in both directions.
Click-clack vs pop-up
Click-clack wastes open and close by pressing the plug. Pop-up wastes use a lever on the tap. Click-clack is simpler and works with any tap.
