Hydrometer Fill Tanks and the water-deionizing cartridges are

and the water-deionizing cartridges are easily replaceable

It also features a user-friendly display that provides clear and concise information about your battery's state

25 GALLON (95 L) CAPACITY

This deionizer is used for batteries equipped with Millennium Evo or Pro-Fill systems

FEATURES GRAY HOUSINGS WILL ONLY PLUG INTO GRAY HOUSINGS

Hydrometer Fill Tanks and the water-deionizing cartridges areHydrometer for Flooded Lead Acid Batteries Our Gefo hydrometers feature a centered aerometer that has no lateral contact with the outer cylinder. You will receive a fast and accurate reading every time from the color coded numerical scale. For use with Millennium Evo flip top valves.