The Aqua Sub Jr. is a compact 9 gallon water delivery tank with collapsible handles for easy transport. Its’ portability makes it ideal for taking on and off service trucks. The pump delivers the correct water pressure to ensure the battery cells are properly watered every time. This two wheeled cart includes a rechargeable battery, charger and direct fill link. The Aqua Sub Jr. can also be used for manual watering by selecting the manual gun end.