6 pack of 1/4-Turn Twist Lock Watering System Battery Caps with Water Level Monitors

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A 6 pack of our 1/4-turn twist lock Bayonet Style watering system battery caps with water level monitors.

  • 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 batteries with a 1/4-turn twist lock bayonet style mount.
  • One 6 pack accommodates two 6 volt batteries.
  • These caps require 2 1/2" 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 caps.

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

3. Install your Ez-Check battery caps.

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.

12 month free replacement against manufacturers defects.

13 Reviews Hide Reviews Show Reviews

  • 5
    ez battery check

    Posted by Ron on Jun 19th 2020

    I like the way they lock in the batteries. They are easy to read and fill. Best of all they are reasonably priced.

  • 5
    Quarter turn water monitors

    Posted by Randall on Mar 2nd 2020

    Fast shopping to Canada Test fit was good have not installed on trailer yet but they sure look like they’ll work

  • 5
    Ez caps are great

    Posted by Mark on Aug 23rd 2019

    Easy to just see what each cell level is without the mess of removing caps. Very simple fill procedure since you don’t even have to remove caps!

  • 5
    RV battery system 2 sets of 6

    Posted by PL on Aug 12th 2019

    These fit great and are used in an RV to monitor water levels in 4: 6v golf cart batteries.

  • 5
    Muy buen producto

    Posted by Unknown on Jun 24th 2019

    Ayuda muy bien es perfecto

  • 5

    Posted by Ramberto Medina on May 6th 2019

    Ready to use

  • 5
    A great way to maintain your batteries

    Posted by Doug on Apr 24th 2019

    These caps are just what I was looking for. They tell you at a glance if your batteries need water. They make it easy to add water. You don't have tubes and hoses all over. I am pleased with the quality.

  • 5
    Excelente Producto !!

    Posted by Alberto Valentin on Apr 22nd 2019

    Excelente para monitorear y llenar las baterías. El envío hacia Puerto Rico fue súper rápido. AAAAA+++++ !!!

  • 5
    Needed but not required....

    Posted by Hector Ortiz on Mar 14th 2019

    These battery Caps are the greatest, they make monitoring your Flooded Batteries a snap, they fit Interstate, Duracell, Die Heart but if I am not wrong these are all made by the same manufacturer. The y are really great for RV's, but came be used on PV or Solar Battery Banks for it is what I used them; to me they are a Most, but from where I am from. they are very hard to come by, I mean Puerto Rico. Still thanks for this great line of products. 73's

    PS. just in case my E-Mail is