Is it possible to get a a rainwater hopper which also has a weir overflow?

Yes, it is possible to install a weir overflow on a rainwater pipe hopper. A weir overflow is designed to allow excess water to escape when the water level reaches a certain height, preventing overflow and potential damage. There are rainwater hoppers available that come with built-in weir overflows. These hoppers are designed to collect rainwater from the guttering system and have integrated overflow mechanisms to handle excessive water levels. Installing a rainwater hopper with a built-in weir overflow can provide a convenient and effective solution for managing rainwater drainage.