The push-button waste works with a dome stopper in the base of the basin, which can be pushed once to open and once again to close. Tarnish and corrosion-resistant, with superior silicone seals and a long-lasting back-nut, which will not break if over tightened. A slotted basin waste has slots which allow any overflowing water to run into the main waste. This is suitable for a basin with an overflow (usually incorporated into the basin moulding). Specifications - Click-clack sprung push button popup mechanism - Easy to use - simply push the centre down to close and allow basin to fill with water - Push once again; the waste will pop up allowing the water to drain away and empty your basin - Solid brass body construction making them durable and long lasting - Finished in chrome ensuring a high quality reflective mirror finish - Safe, easy to clean, use and install - Universal standard size.