Pressure Tank

This is a pressure tank. The uses are When your water pump turns on, it fills this tank. Inside the tank is a rubber bladder filled with air. As water enters, it compresses that air. The Benefit: When you turn on a tap, the compressed air pushes the water out first. This means your pump doesn't have to turn on and off every single time you wash your hands, which saves electricity and prevents the pump from burning out.