Keep your batteries breathing right with this screw-in vent cap adapter. It’s made by Flow Systems and uses their Water Miser tech, which basically helps reduce water loss in your batteries—super handy for golf carts, RVs, solar setups, and other deep-cycle battery applications.

It’s brand new in the package, made right here in the USA. The model is listed as Standard Golf Cart Solar, and the MPN is 4D8DSIA. No UPC, but that’s fine—it’s a niche product that does one job really well.

If you’re tired of constantly topping off battery water or just want a more efficient venting system, this little adapter can help. Screws right into the battery vent port, easy to install, and helps extend battery life. Perfect for DIYers, solar enthusiasts, golf cart owners, or anyone running off-grid power.