Dissipater battery vent cap solves many maintenance problems. A patented design dissipates heat and returns water to the battery during charging. Overflow protection holds expanded acid during recharging, eliminating over-watering. A built-in eye indicates the electrolyte level in every cell. A patented filtration system reduces harmful gases by filtering odors and creating a healthy environment. Dissipater Mfg./ITW Delpro: www.dissipater.com