Single-Press 12 Volt 3/4" Round Press in Watering System Battery Cap with Water Level Monitor

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A single 12 volt 3/4" press in watering system battery cap with water level monitor.

  • The quick, simple, and safe way to maintain your deep cycle batteries.
  • Easy to see water level indicators. 
  • Allows for the watering of batteries without having to remove the caps.
  • Built in ceramic filter that acts as fume arrestor.
  • Anti-splash to protect against acid spills.
  • Fits most 12 volt batteries with a round 3/4" press in hole.
  • Most 12 volt deep cycle Marine & RV Group 24,27,29, & 31 batteries
  • These caps require 2 1/4" of clearance above the battery mounting surface.
  • Works great with our squeeze bulb, squeeze bottle, or 1 gallon Ez battery filler.


Quick and easy installation:

1. Remove your old battery cap.

2. Fill your battery to the manufacturer recommended level with distilled water.

3. Install your Ez-Check battery cap.

4. Adjust the O-ring to just below the red float indicator.

5. Now when the red indicator dips below the O-ring you know it's time to water your battery.

6. Remove the rubber cap on the nipple of the battery cap and fill slowly until the red indicator rises back above the O-ring.

7. Install the rubber cap and continue to monitor at regular intervals.

3 Reviews Hide Reviews Show Reviews

  • 3
    Not for NAPA 8231 batteries

    Posted by Leo Suarez on Aug 7th 2020

    I bought this water level monitor to check the water on my NAPA 8231 batteries on my diesel pusher which are very difficult to see water level without removing them. They do not fit the battery as a permanent install as advertised. There is no EZbattery level monitor that you can install on 8321’s. But the valve will fit through the battery hole such that you can insert it, hole by hole and see if there is enough water. Too bad it is a great system and idea but not as a permanent solution for NAPA 8231’s.

  • 5
    Single-Press cap can be used to check and add fluid in NAPA 8231 that has screw-on caps by sitting the single-press cap on the battery top above the cell.

    Posted by Steve on Jul 19th 2019

    On our 2019 Winnebago Forza the 4 batteries have to be removed to check the fluid levels and add fluid as needed.
    The Press-On cap has a gauge shaft length long enough to measure the fluid level by placing the cap over the cell and add liquid as necessary so the battery cells can be checked with out removing the batteries.

  • 5
    12 volt push in HD battery

    Posted by Bob from Vegas on Nov 24th 2018

    This is the best thing device i have ever used to check battery fluid levels , no more mirrors and a flashlight or trying pry open the lids or cleaning acid of your hands or clothes. the inventor needs a big pat on the back..