One of the most commonly used systems in your home or commercial building is the drain system. In fact, all of the rooms that contain a water source - have a drain.
The drain system for your home or commercial building is responsible for carrying the used water and waste materials out to the municipal sewer line.
For instance, if there weren’t a drain in your kitchen sink, then when you used the sink to wash pots and pans after meal preparation all of the water and food particles would just wash out the hole in the bottom of the sink and onto the floor.
Instead, your sinks, bathtubs, showers, and toilets are all equipped with a drain that is configured to carry any used water or waste that is created by the fixture or appliance away.