BFS Battery Water Fill System for golf cart, RV, etc. (24 caps) - $40 (Indio)
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German made BFS battery water fill system. Over the last twenty years I have used BFS watering caps on four motorhomes, two camping / toy hauler trailers and several golf carts and have NEVER had a battery problem related to using them. Unlike some systems with fixed manifolds that are designed for use on specific battery brands these caps can be used on ANY battery with the bayonet (twist on) fill ports regardless of brand or fill hole spacing.
Removable battery specific floats are used to ensure that the water level in each cell is maintained according to the battery design and the manufacturers specifications. The floats can be purchased from BFS or several aftermarket distributors. I have hooked all of my systems up to a plastic automotive windshield washer reservoir. Press a button, or flip a switch, and in a few seconds (less than the time it would take to remove the caps) the tank's pump fills each cell until the white cap pops up shutting off the flow filling each cell to the correct water level. The rubber hose or plastic tubing connecting each cap can be cut to any length to accommodate various battery designs - AND - the system can be removed and installed on your next vehicle or set of batteries.
This set comes with twenty four caps (P/N 51000) and # 34 floats (P/N 072234), which fits ALL of the batteries on the attached list.
Here is the BFS website for more information, including the battery float guide for various batteries.