Mighty Max Jug Battery Filler is designed to be exceptionally resistant to automotive fluids employed in the processes of servicing batteries, master cylinders, etc. The Mighty Max Jug Battery Filler is a 2 qt. Plastic Jug for Filling and Adding Water to Wet Batteries. Made out of Durable Acid proof polyethylene. Shuts off automatically when battery cell is at proper level, no over filling. Features the double action fast flow valve tip that prevents after-drip. 2 qt. capacity battery filler is safe to use with battery acid. Stops surface discharge caused by wet battery.