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Old 04-16-2016, 08:22 AM   #93
BandB
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City: Fort Lauderdale
Country: USA
Join Date: Jan 2014
Posts: 17,695
Flow-rite may make the most popular fill system.

https://flow-rite.com/battery-watering/pro-fill

Trojan has their Hydrolink system.

HydroLink Watering System | Trojan Battery Company

And there are many others out there. It seems golf carts have actually driven much of this market.
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