Vent Cap Wrench for Basement Watchdog sump battery

My Basement Watchdog sump pump backup battery has vent caps that can be somewhat tight and hard to turn. I top off the cells with distilled water every 6 weeks. This wrench makes the job much easier.

The example shown is HatchBox Red PLA, printed with 15% infill, 5 perimeters minimum, 5 bottom solid layers. At 35mm/s it is a 3-hour print with the 15% infill.

Darn it ! The first time I used the wrench to top off the battery, I discovered that the yellow cap that holds the level se