Basin Wastes 40mm Outlet (thread) Size

A basin waste is the drainage fitting at the bottom of the basin that allows water to drain while also providing a plug function when needed. Basin wastes in Australia are available as click-clack (pop-up operated by pushing down), plug-and-chain (traditional rubber or metal plug on a chain), and slotted or unslotted designs (slotted versions allow the basin overflow to function). Choose a waste that matches your tapware and basin finish for a cohesive look.

Most Australian basins require a 32mm or 40mm diameter basin waste. The basin manufacturer's specifications will confirm the correct size. Ensure the thread size (typically 1¼" or 1½") matches your trap and waste pipe connection. Always check the waste specifications of your basin before ordering.

A slotted basin waste has a slot in the collar that aligns with the overflow outlet in the basin, allowing overflow water to drain. An unslotted waste is used on basins with no overflow hole. Installing an unslotted waste in a basin with an overflow will block the overflow and is a potential safety issue, always match the waste type to your specific basin.