WIT (Water Injection Technology) is a specialized plastic injection process that enables the production of parts in shapes and sizes that would otherwise be impossible, even with cores or similar movable elements. 

For example, a solid, shaped pipe can be made hollow by injecting pressurized water into it after molding, allowing it to be removed from the injection cycle in one step, regardless of how complex its shape may be. 

This process can also be used to reduce weight.