These watering system vent caps include a water level monitor to check the electrolyte level in each cell. The integrated filling inlet allows water to be added as needed without having to remove the caps. The caps fit 3/4" round press fit style mounts that are common on many 12 volt deep cycle Marine and RV batteries sold in the U.S. These caps require 2 1/4" of clearance above the battery mounting surface.
The Easy, Quick, and Safe way to maintain 12 Volt Deep Cycle Marine & RVBatteries.