Flow-Rite MP2000 Qwik-Fill 2 Battery Kit .....installed easy and works really good no more getting on knees to check and fill batts. on 2012 31sl....from amazon...you'll need to add filler squeeze bulb and your set....
yes, even though our coaches batteries are much, MUCH easier to access than the redwoods ever were, we still use this - makes checking and adding water a 10 minute job.
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Ours: '11 Monaco Diplomat 43DFT followed closely by '14 Jeep 4 dr Wrangler.
Hers: '13 Explorer Sport - AWD 365hp twin turbo scooter!
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