A tub shower diverter is a plumbing fixture that allows you to switch the flow of water from the tub spout to the showerhead. It is typically located on the wall of the shower or bathtub, and it consists of a handle that you can turn to change the water flow. If your tub shower diverter is not working properly, you may need to replace it.
There are a few different types of tub shower diverters, but the most common type is the cartridge diverter. This type of diverter has a removable cartridge that can be replaced if it becomes worn or damaged. To replace a cartridge diverter, you will need to remove the handle, unscrew the cartridge, and insert a new cartridge.