The Waterous FoamFill™ Foam Tank Refill System is completely-automated, making it easier, safer, cleaner and quicker to top off the foam tank or tanks in your apparatus.Waterous FoamFill™ Foam Tank Refill System can be used with both Class A and B foam. When turned on, a microcontroller inside the FoamFill™ identifies the foam levels in the tank or tanks. If the levels are low, FoamFill™ automatically fills them without overflowing, operating at a capacity of 10 GPM (37.8 L/min.).