When you are upgrading your existing trash disposal, make sure you are aware of the parts that you will need to purchase and which will have to be replaced. Before you start to install your new garbage disposal, you should check the parts of your existing disposal to determine the condition of the parts and how old they are. You should also look into the warranty for the parts of your garbage disposal to see if they cover replacement of parts.
There are some parts of a new garbage disposal that are not easily replaced such as the bag handle. The bag handle will have to be replaced before you can install the new garbage disposal. Therefore, you should be prepared to spend a lot of money on replacement of the handle.
If you decide to upgrade your current garbage disposal, you may want to consider whether or not you should install a water pump at the same time. However, you should first assess the cost of installing a water pump so that you can purchase the pump without any hesitation. By doing this, you will be able to avoid the need to replace your existing water pump after you install your new garbage disposal.