Basin wastes are available in various styles from the traditional plug and chain to the more modern push button (also known as click clack) ranges. This is the most popular option of waste, as it has a simple design making it easy to use. Push down on the stopper once to close it and click it again to open it. Other options are the flip top waste that is hinged on either side vertically, meaning that you flip the stopper and water can flow through or be stopped for filling the basin. A simple design and easy to use function. If your basin has an overflow hole it will require a slotted basin waste. An unslotted waste is for basins without an overflow.