What limits the volume of waste entering a grease trap?

The correct answer is a flow control fitting. This fitting is specifically designed to regulate the amount of water and waste that enters the grease trap. It ensures that the flow rate does not exceed the trap's capacity, which is essential in maintaining the effectiveness of the device in separating grease and solid waste from the wastewater. By controlling the flow, it helps prevent overloading the trap, which can lead to inefficiencies and potential backups in the plumbing system.

While a valve can control flow in general, it does not specifically regulate the volume entering the grease trap like a flow control fitting does. A baffle is usually used within the grease trap to direct the flow and enhance separation of grease from the waste, but it does not limit the volume of waste entering. A pump is used to remove waste from the trap but is not involved in initially controlling how much waste enters it. Thus, the flow control fitting is the key component that effectively limits and manages the volume of waste entering a grease trap.