Qwik-Fill is for 12V batteries. Pro-Fill is for 6V batteries. According to the FAQ's "A maximum of 6 batteries can be plumbed together with the Pro-Fill RV Edition system, although many users prefer (for ease of filling) to limit the number of batteries plumbed together at 4."
https://flow-rite.com/battery-wateri.../faqs#t74n1287
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1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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