This is a 2 in 1 cistern and basin replacement for a close coupled toilet. This sleek design allows for as much free floor space as possible. The wastewater from the sink flows directly into the cistern underneath, helping to reduce waste. Please Note: This product comes with a 10-year guarantee. This is a 2-in-1 basin and cistern with a space-saving design. The cistern is designed to accommodate the wastewater from the bathroom sink, making it ideal for small spaces.