This sturdy 20 gallon (75.7 liter) high density polyethylene tank easily transports water to your batteries. Fill the tank from any available water source. The HydroCart handles like a hand truck and is AC powered. When the switch is turned on, the pump is activated. Simply connect to the Water Injector System™ and activate the Instant Valve Pro™. A flow indicator will tell you when all of the Injector valves have shut off and it is time to disconnect. Drop ships directly from supplier.