Battery Watering System Caps with Water Level Monitors for Batteries with 1/4-Turn Bayonet Style Mounts. A 6-Pack of Caps plus A Battery Filling Squeeze Bulb

These fit perfect, they are adjustable so you can set them to read correctly for your particular battery level. The squeeze ball filler makes it easy to control the water flow when filling a battery cell.

These work great. I just installed 12 of them on 4 6V batteries in my coach and they work as described. its nice to see your water levels at a glance and it makes filling the water much easier. The hand pump works great too.

Awesome on many battery types. Warning, does NOT work properly on Trojans. The float gets stuck on a lip.

Product preformed as advertised.Installed on RV batteries.Allows you to keep an eye on battery water levels without having to pull them out of their storage compartment.

Its a great product. Very well made works great. Phelps keep my batteries topped off.

Súper fácil de instalar y súper eficientes en le uso. Envío rápido. Gracias!

wanted for all the battery's in the RV.

In my opinion, this battery filler is a complete waste of money. After two months of use, I had to remove it and put the original caps back on. The "floats" in these caps do not float so you really have no indication of if the battery cells are full or not. When you try to fill the cells with these caps on, the floats once again stick so you overfill the battery cells which is not good. So in summary, they don't tell you when the cells are getting low and they don't tell you how much water you are adding. So unless you need expensive battery caps, save your money and your batteries.